AudioMoth Acoustic Logger Review: Your Wildlife Monitoring Experience

Imagine standing in a forest at dawn, trying to record every bird call, bat echo, and frog chirp around you. Now imagine a small device doing all that work while you sleep, eat, or focus on other important tasks. The AudioMoth Acoustic Logger makes this possible. This tiny, credit card sized recorder has changed how researchers, conservationists, and nature lovers monitor wildlife sounds.

This innovative device offers full spectrum acoustic monitoring at a fraction of the cost of traditional equipment. You can capture sounds from deep bass notes to ultrasonic bat calls. The AudioMoth sits quietly in forests, wetlands, or your backyard, recording nature’s symphony without any human presence. Whether you study endangered species, track biodiversity changes, or simply love listening to nature, this acoustic logger provides an accessible entry point into the world of passive acoustic monitoring.

Key Takeaways

• Affordable Wildlife Monitoring: AudioMoth costs around $50 to $80, making professional grade acoustic monitoring accessible to everyone, from students to experienced researchers
• Full Spectrum Recording Range: The device captures sounds from 8 kHz to 384 kHz sample rates, covering everything from elephant rumbles to bat echolocation calls
• Extended Battery Life: Three AA batteries can power continuous recording for 7 to 9 days at standard settings, or months when using scheduled recording periods
• Open Source Flexibility: The platform allows customization through open source firmware, enabling users to modify features and add functionality based on specific research needs
• Weather Resistant Options: Multiple protective case options make AudioMoth suitable for underwater recordings, rainforest deployments, and harsh environmental conditions

What Makes AudioMoth Acoustic Logger Special

The AudioMoth represents a major shift in acoustic monitoring technology. Before this device entered the market, professional acoustic loggers cost anywhere from $500 to $2000. This price barrier prevented many researchers, especially those in developing countries or working with limited budgets, from conducting sound based wildlife studies.

AudioMoth changed everything by offering similar capabilities at roughly one tenth the price. The device measures just slightly larger than the three AA batteries that power it. This compact size allows deployment in tight spaces, on thin branches, or in areas where larger equipment would be too conspicuous. The board design is simple yet effective. A micro electro mechanical systems microphone sits at the heart of the device, capturing sounds with impressive clarity.

The EFM32 Gecko processor handles all recording operations. This processor manages everything from timing schedules to file writing. Users record directly to a microSD card, with support for cards up to 512GB. At standard bird monitoring settings, a 64GB card can store weeks of recordings. The device runs on readily available AA batteries, either alkaline or rechargeable NiMH types. This accessibility means you can buy replacement batteries anywhere in the world.

Recording flexibility stands as one of AudioMoth’s strongest features. The configuration app allows users to set multiple recording periods throughout each day. You might record only during dawn and dusk when birds are most active, or focus on night hours for bat monitoring. This scheduled recording extends battery life dramatically, allowing deployments lasting several weeks or even months.

Understanding AudioMoth Technical Specifications

Technical specifications reveal what AudioMoth can actually accomplish in the field. The device records at sample rates ranging from 8,000 to 384,000 samples per second. Lower sample rates like 8 kHz work well for capturing deep sounds like gunshots, chainsaws, or large mammal vocalizations. The 48 kHz sample rate has become the standard for bird, frog, and insect monitoring, capturing all audible frequencies clearly.

Higher sample rates unlock ultrasonic monitoring capabilities. Bat researchers typically use 192 kHz or 384 kHz settings to capture echolocation calls. Some amphibians also vocalize in ultrasonic ranges, making these higher settings valuable for herpetology studies. The AudioMoth records in uncompressed WAV format, ensuring maximum audio quality without compression artifacts.

The signal to noise ratio measures 44.2 dB. While this specification falls below some commercial alternatives, field tests show AudioMoth captures wildlife sounds effectively in most monitoring situations. The slightly lower SNR mainly affects detection distance for very quiet or distant animals. For most applications, the audio quality proves more than adequate.

Power consumption varies based on recording settings. At 48 kHz sample rate with continuous recording, three AA batteries typically last 7 to 9 days. The configuration app calculates estimated battery life based on your specific settings. This helps plan deployments and battery replacement schedules. The device enters a low power sleep mode between scheduled recordings, consuming minimal energy. In sleep mode, the clock keeps running for up to 6 years on a single set of batteries.

Setting Up Your AudioMoth Device

Setting up AudioMoth requires minimal technical knowledge. First, you need three AA batteries and a microSD card. Cards between 32GB and 128GB work well for most projects. Format the card to FAT32 before first use. Insert the batteries into the holder on the back of the AudioMoth board. The battery contacts are clearly marked for correct polarity.

Next, download the AudioMoth configuration app from the Open Acoustic Devices website. The app runs on Windows, Mac, and Linux operating systems. Open the app and connect your AudioMoth to your computer using a micro USB cable. Set the switch on the AudioMoth to USB/OFF position. The green LED should illuminate, indicating proper connection.

The configuration interface presents several options. Set your local time zone so recordings have accurate timestamps. Choose your sample rate based on target species. For general bird monitoring, 48 kHz provides excellent results. Select recording periods using the schedule interface. You can create multiple recording windows each day. Many users record from one hour before sunrise to three hours after, then again in the evening.

Gain settings control microphone sensitivity. Low gain works in noisy environments or when recording loud sounds. Medium gain suits most wildlife monitoring situations. High gain helps detect quiet or distant animals but may introduce more background noise. Start with medium gain and adjust based on your results.

After configuring all settings, click the green button to apply configuration. The app writes settings to the AudioMoth and sets the internal clock. Disconnect the USB cable and switch the AudioMoth to CUSTOM position. The red LED will flash briefly to confirm recording schedule is active. Insert the microSD card and deploy your device.

Best Recording Settings for Different Wildlife

Different animals require different recording approaches. Bird monitoring typically uses 48 kHz sample rate with medium gain. This captures all bird vocalizations clearly while keeping file sizes manageable. Schedule recordings to match bird activity patterns. Most songbirds vocalize heavily from 30 minutes before sunrise until about three hours after. Evening choruses often occur from two hours before sunset until dark.

Bat monitoring demands higher sample rates. Most bat researchers use 256 kHz or 384 kHz settings. These ultrasonic frequencies capture echolocation calls that bats use for navigation and hunting. Bats are nocturnal, so schedule recordings from sunset to sunrise. Gain settings for bats depend on environment. Open areas may benefit from high gain to detect distant calls. Cluttered habitats often work better with medium gain to reduce echo noise.

Amphibian studies typically use settings similar to bird monitoring. Frogs and toads vocalize in audible ranges, making 48 kHz appropriate. However, some researchers push to 96 kHz to capture higher frequency components of calls. Amphibians often vocalize during and after rain events. Consider deploying AudioMoth near water bodies during breeding seasons.

Marine mammals recorded through HydroMoth use specialized settings. Dolphin whistles and clicks require high sample rates, often 192 kHz or higher. Whale songs span lower frequencies, so 48 kHz or 96 kHz captures them well. Underwater deployments face unique challenges with pressure, temperature, and battery life.

Insect monitoring covers a wide range. Grasshoppers and crickets produce sounds in audible ranges, suitable for 48 kHz recording. Some moths and other insects generate ultrasonic sounds requiring 192 kHz or higher. Set gain carefully, as insect choruses can be extremely loud at close range.

Top 3 Alternatives for AudioMoth Acoustic Logger

AudioMoth Battery Life and Power Management

Battery performance directly impacts deployment success. AudioMoth’s low power design enables extended field deployments, but understanding power consumption helps maximize recording time. The configuration app displays estimated battery life based on your recording schedule and settings. This estimate assumes fresh, high quality batteries.

Alkaline batteries provide the most readily available power source. Standard AA alkalines work well for shorter deployments up to two weeks. They perform adequately in moderate temperatures but lose capacity quickly in cold conditions. Cost effective and widely available, alkalines suit projects where you can check devices regularly.

Lithium AA batteries deliver superior performance for longer deployments. These batteries maintain voltage better than alkalines, especially in cold weather. A lithium battery can power AudioMoth for 50 percent longer than an equivalent alkaline. The higher upfront cost pays off in extended deployment time and reliability in challenging conditions. Lithium batteries also weigh less, important when deploying multiple units.

Rechargeable NiMH batteries offer an economical choice for frequent users. Modern NiMH cells with 2500 to 2800 mAh capacity work well in AudioMoth. These batteries perform better than alkalines in recent AudioMoth versions with improved voltage regulation. The ability to recharge batteries reduces long term costs and environmental impact. Keep several sets charged and ready for quick battery swaps during field work.

Power consumption patterns vary by recording mode. Continuous recording at 48 kHz draws approximately 60 mA. The sleep mode between scheduled recordings consumes less than 0.1 mA. A typical bird monitoring schedule might record 20 percent of each day, dramatically extending battery life compared to continuous recording. Calculate your expected battery life by considering recording duration, sample rate, and gain settings.

Storage Capacity and Memory Card Selection

Memory cards store all your precious recordings, making card selection important. AudioMoth supports microSD and microSDHC cards from 4GB to 512GB. The file system must be FAT32 format. Cards larger than 32GB typically come formatted as exFAT, requiring reformatting before use.

File sizes grow with sample rate and recording duration. A one minute recording at 48 kHz sample rate creates approximately 5.5 MB of data. At this rate, a 64GB card stores roughly 11,500 minutes or 192 hours of audio. This capacity matches well with battery life at this sample rate, with storage and batteries running out at similar times.

Higher sample rates generate larger files. Recording at 384 kHz for bat monitoring produces about 44 MB per minute. A 64GB card stores only 1,450 minutes or 24 hours of ultrasonic recordings. Match your memory card size to your recording schedule and sample rate. For intensive bat monitoring, consider 128GB or 256GB cards.

Card speed matters less than capacity for AudioMoth. The device writes data well within the capabilities of Class 4 or Class 10 cards. However, faster cards transfer data to your computer more quickly when analyzing results. UHS Class 1 cards provide good performance at reasonable prices.

Card reliability deserves serious consideration. Audio recordings represent hours or weeks of field work. A failed memory card means lost data and wasted deployment time. Choose reputable brands known for reliability. SanDisk, Samsung, and Kingston offer reliable cards at various price points. Avoid ultra cheap cards from unknown manufacturers, as these often fail prematurely.

Format cards before each deployment to ensure a clean file system. The AudioMoth writes new WAV files for each recording period. File names include date and time stamps for easy organization. Check cards regularly during longer deployments if accessible. This allows detecting problems early and replacing cards if needed.

Protective Cases and Weatherproofing Options

AudioMoth arrives as a bare circuit board, requiring protection for field deployment. Several case options address different environmental challenges. The official IPX7 Waterproof Case provides reliable protection for terrestrial deployments. This injection molded polycarbonate case seals with a compression o ring and easy clasp system.

The IPX7 case features a rain hood that prevents water pooling on top. An acoustic vent protects the microphone opening while allowing sound to pass through. This Gore waterproof vent maintains audio quality while excluding water and dust. The case comes with an adjustable velcro strap for securing to trees, poles, or other mounting points. This case handles rain, humidity, and splashing without issues.

Underwater deployments require the specialized Underwater Case or HydroMoth. The Underwater Case uses thicker walls and stronger seals, tested to 30 meters depth for extended periods. HydroMoth includes modified electronics specifically designed for underwater use, with repositioned LEDs visible through the case and a magnetic switch for starting recordings without opening the case.

DIY protection methods offer budget conscious alternatives. Many researchers use plastic bags sealed with desiccant packets. This simple approach works for dry to moderate conditions. Others 3D print custom cases or modify existing electronics enclosures. DIY methods require more effort but allow customization for specific needs. Always test homemade protection thoroughly before deploying in harsh conditions.

Acoustic considerations matter when choosing protection. Every barrier between microphone and environment affects sound quality. Plastic bags may flutter in wind, creating noise. Sealed cases without proper vents muffle sounds and reduce frequency response. The official cases use carefully designed acoustic vents that maintain audio quality while providing weather protection. Balance protection needs against potential audio degradation when selecting or designing cases.

Deploying AudioMoth in the Field

Successful deployment requires planning beyond just setting up the device. Location selection dramatically impacts recording quality and data value. Place AudioMoth near target habitats while avoiding areas with excessive human noise. Roads, buildings, and industrial sites introduce unwanted sounds that can mask wildlife vocalizations. Even distant traffic creates low frequency rumble that fills recordings.

Height matters too. For bird monitoring, placing recorders 1 to 2 meters above ground provides good coverage. This height reduces ground level insect noise while maintaining sensitivity to canopy birds. Bat monitoring often benefits from higher placement, 3 to 5 meters up, as bats typically fly above ground level. Amphibian studies place recorders near water level, where frog calls resonate loudest.

Microphone orientation affects detection patterns. The AudioMoth MEMS microphone sits on the board facing forward. Point this side toward the area of interest. The microphone picks up sounds from all directions but is most sensitive to sounds arriving from the front. Avoid pointing the microphone directly at potential noise sources like roads or generators.

Attachment methods depend on location. Velcro straps work well for attaching to tree trunks or branches. Use two straps for extra security in windy locations. Cable ties provide stronger attachment but may damage tree bark if too tight. Some researchers build mounting posts, especially useful in open habitats without suitable trees. PVC pipes or wooden stakes can hold AudioMoth at consistent heights across multiple sites.

Security concerns vary by location. AudioMoth’s small size makes it less conspicuous than large commercial recorders. However, the green LED flashing during scheduled recordings can attract attention. Some users paint cases camouflage colors or wrap them in natural materials. High theft risk areas may require lock boxes or cable locks. Remember that deterring casual interference differs from preventing determined theft. Focus on making devices less noticeable rather than impenetrable.

Check deployments periodically when possible. Initial checks after 24 to 48 hours help identify problems early. Verify recordings are being made, check audio quality, and ensure weather protection is working. Adjust settings if needed before committing to longer deployments.

Analyzing AudioMoth Recordings

Recording represents only the first step in acoustic monitoring. Analysis transforms audio files into useful data about wildlife populations and behaviors. AudioMoth generates standard WAV files readable by any audio software. This open format enables using various analysis tools based on project needs.

Manual analysis involves listening to recordings and identifying species. Audio software like Audacity, Raven Lite, or Adobe Audition allows visualizing spectrograms while playing sounds. Spectrograms display frequency content over time, making it easier to see and identify calls. Many experienced birders can identify species by ear, making manual analysis straightforward for short recordings.

However, long term monitoring generates far too much audio for manual review. A single AudioMoth recording continuously for one week creates over 1,000 hours of audio. Automated analysis becomes essential for large datasets. Several software platforms process acoustic recordings automatically.

BirdNET provides free automated bird call identification. This neural network model recognizes over 3,000 bird species. The software scans recordings, detects bird vocalizations, and suggests species identifications with confidence scores. BirdNET works reasonably well for common species but struggles with rare birds or poor quality recordings. The software continues improving through ongoing development.

Kaleidoscope offers professional analysis tools for bats and birds. This Wildlife Acoustics software includes species specific classifiers and sophisticated filtering. The commercial software costs money but provides more accurate identification than free alternatives. Many bat researchers rely on Kaleidoscope for automated call identification.

R programming enables custom analysis workflows. The monitoR, tuneR, and seewave packages provide tools for acoustic analysis. Programming knowledge is required, but R offers maximum flexibility for unique projects. Researchers can develop species specific detection algorithms or extract custom measurements from recordings.

Organize recordings systematically before analysis. Create folder structures by date, location, or recording session. Consistent naming conventions help manage thousands of files. Document recording settings, deployment conditions, and any observations made during setup or retrieval. This metadata contextualizes acoustic data and helps interpret results.

Understanding AudioMoth Audio Quality

Audio quality determines what you can detect and identify from recordings. AudioMoth provides good quality for a low cost device, though understanding its capabilities and limitations helps set realistic expectations. The signal to noise ratio of 44.2 dB indicates how much stronger recorded signals are compared to background noise.

This SNR measurement falls below professional recorders like Wildlife Acoustics Song Meter units, which achieve 73 to 80 dB. The practical impact shows in detection distance. AudioMoth may detect a singing bird at 50 meters, while a Song Meter detects the same bird at 75 meters. For many projects, AudioMoth’s detection range proves sufficient, especially when targeting common species or monitoring presence rather than conducting precise population surveys.

Frequency response remains fairly flat across the audible range. The device captures low frequency sounds like distant thunder and high frequency sounds like insect chirps with similar sensitivity. This balanced response works well for general biodiversity monitoring. However, the MEMS microphone shows reduced sensitivity at extreme low frequencies below 100 Hz and extreme high frequencies above 100 kHz.

Self noise refers to noise the device itself generates. AudioMoth v1.2.0 improved self noise compared to earlier versions. The newer board design positions components to minimize electronic interference. In quiet environments, recordings reveal a faint background hiss. This noise floor rarely interferes with wildlife detection except for extremely quiet or distant sounds.

Wind noise challenges all outdoor acoustic monitoring. Wind creates turbulence around the microphone, generating low frequency rumble that can overwhelm recordings. Windscreens help but cannot eliminate wind noise completely. The IPX7 case provides some wind protection, though custom windscreens made from foam or fur improve performance further.

Recording gain settings significantly affect audio quality. High gain amplifies both signals and noise. Use high gain only when targeting quiet sounds in calm conditions. Medium gain suits most wildlife monitoring, providing good sensitivity without excessive noise. Low gain works in loud environments or when recording close range sounds.

Common AudioMoth Problems and Solutions

Every monitoring project encounters challenges. Understanding common AudioMoth issues helps troubleshoot problems and prevent failures. Clock drift affects timing accuracy. The device uses a 32.768 kHz crystal oscillator to keep time. This clock can drift several minutes over extended deployments. GPS equipped AudioMoth variants synchronize time accurately, eliminating drift. Standard units require manual clock checks and resets for precise timing needs.

Failed recordings frustrate users when AudioMoth doesn’t record as expected. First, verify the configuration was applied correctly. Connect the device to the configuration app and check settings. Ensure the switch sits firmly in CUSTOM position. Check that the red LED flashes when entering CUSTOM mode, confirming the schedule is loaded. Verify battery voltage is adequate. AudioMoth stops recording when batteries drop below operating voltage.

Memory card errors cause recording failures. Incompatible cards, corrupted file systems, or fake capacity cards all create problems. Always format cards to FAT32 before use. Test cards in the device before deploying. Write test recordings and verify files play correctly. Avoid ultra cheap cards from unknown manufacturers, as these often have quality issues or fraudulent capacity claims.

Audio quality problems require systematic diagnosis. Static, crackling, or distorted recordings may indicate loose microphone connections, water damage, or gain set too high. Inspect the board for obvious damage. Try recording in controlled conditions to isolate environmental factors. Very noisy recordings often result from wind, rain on the case, or the device touching vibrating surfaces.

Battery life shorter than expected has several possible causes. Cold weather dramatically reduces battery performance. Alkaline batteries lose capacity quickly below 10 degrees Celsius. Switch to lithium batteries for cold weather deployments. Verify recording schedule matches your calculations. Accidentally setting continuous recording instead of scheduled periods drains batteries rapidly. Check for firmware issues by updating to the latest version.

LED problems occasionally occur. The green LED indicates USB connection and charging. Red LED flashes during recording and when entering CUSTOM mode. If LEDs don’t illuminate, check battery installation and voltage. Completely dead batteries prevent LED operation. Damaged LEDs still allow normal recording, just without visual feedback.

AudioMoth Firmware and Software Updates

AudioMoth’s open source nature enables continuous improvement through firmware updates. Firmware is the software that runs on the AudioMoth itself, controlling all recording functions. The development team regularly releases updates that fix bugs, improve performance, and add features.

Standard firmware provides basic recording functionality suitable for most users. This firmware supports scheduled recording, adjustable sample rates, and gain control. Recent updates improved battery voltage monitoring, added amplitude threshold triggering, and enhanced time keeping accuracy. Most users install standard firmware and never need alternatives.

Specialized firmware versions address specific applications. AudioMoth USB Microphone firmware converts AudioMoth into a real time USB microphone for computers. This enables live monitoring and streaming applications. AudioMoth GPS Sync firmware synchronizes multiple AudioMoth units using GPS time signals, enabling coordinated multi point recordings for sound localization studies.

Acoustic threshold triggering conserves storage and battery by recording only when sounds exceed a set level. This feature works well for detecting loud events like gunshots, chainsaw operation, or elephant vocalizations. The device stays silent during quiet periods and springs to life when sounds occur. This approach can extend deployment times tenfold compared to scheduled recording.

Filter configuration enables frequency based triggering. Set the device to record only when sounds in specific frequency bands occur. This helps target particular species while ignoring others. For example, configure filters to detect bat ultrasound while ignoring audible bird calls.

Updating firmware requires connecting AudioMoth to a computer via USB. Download the firmware file and flash tool from Open Acoustic Devices website. Run the flash tool, select your firmware file, and click program. The process takes just seconds. The device automatically reboots with new firmware installed. Test recording after updating to verify proper operation.

Configuration app updates appear regularly too. These updates improve user interface, add new features to configuration options, and fix software bugs. The app automatically checks for updates when you launch it. Download and install updates to ensure compatibility with the latest firmware versions.

Comparing AudioMoth with Commercial Alternatives

Understanding how AudioMoth compares to commercial recorders helps choose the right tool for your needs. Wildlife Acoustics Song Meter represents the leading commercial acoustic logger brand. Song Meter devices range from the compact Micro 2 model to the full featured SM4. These units cost $400 to $1000, significantly more than AudioMoth.

Song Meters provide superior audio quality with signal to noise ratios reaching 80 dB. This translates to detecting sounds at greater distances and better performance in noisy environments. The devices include weatherproof enclosures, larger battery compartments supporting D cell batteries, and more rugged construction. Pre programmed features include sunrise sunset triggering, GPS logging, and acoustic event detection.

Recording duration favors Song Meters for continuous monitoring. The SM4 running on D cell batteries can record continuously for weeks. AudioMoth achieves similar total recording time through scheduled recording rather than continuous operation. Choose Song Meter when you need true 24/7 recording for extended periods. AudioMoth excels when scheduled recording covers your needs at much lower cost.

Swift Bat Detector and Anabat units serve specialized bat monitoring markets. These devices cost $500 to $1500 and provide features tailored to chiroptera research. Full spectrum Anabat Swift competes directly with AudioMoth’s ultrasonic capabilities. Zero crossing Anabat Express uses different recording methods more suitable for species with distinctive call structures. For serious bat research, these specialized devices offer advantages. For multi species monitoring including bats, AudioMoth provides better value.

Cost remains AudioMoth’s greatest advantage. Projects can deploy ten AudioMoth units for the price of one Song Meter Micro. This numbers advantage enables covering larger areas, replicating sites, or accepting higher loss risk in challenging conditions. Graduate students, citizen scientists, and researchers in developing countries access professional monitoring capabilities through AudioMoth.

Ease of use varies across devices. Song Meters include LCD screens for on device configuration. AudioMoth requires computer connection for setup. However, the AudioMoth configuration app is simpler and more intuitive than Song Meter software. Neither approach is clearly superior, just different.

Using AudioMoth for Different Research Applications

AudioMoth serves diverse research needs across ecological disciplines. Biodiversity surveys employ AudioMoth to document species presence across large areas. Deploy recorders in grid patterns or along transects. Record for several days at each location during peak activity periods. Analysis reveals which species occur where, informing conservation priorities and baseline monitoring.

Population monitoring tracks changes in wildlife abundance over time. Establish permanent monitoring points and record seasonally or annually. Compare detection rates across time periods to identify population trends. This approach works especially well for vocal species like songbirds or amphibians. Long term datasets reveal population responses to habitat changes, climate shifts, or management actions.

Behavioral studies examine diel activity patterns, seasonal breeding phenology, and social interactions. Continuous or intensive scheduled recording captures when animals vocalize throughout day night cycles. Identify dawn chorus timing, evening singing periods, or nocturnal activity patterns. Compare vocal behavior across seasons to understand breeding periods and migration timing.

Soundscape ecology studies entire acoustic communities rather than individual species. AudioMoth records all sounds at a location, both biological and anthropogenic. Analyze recordings to calculate acoustic indices measuring diversity, evenness, and complexity. Compare soundscapes across habitat types or urbanization gradients. This approach reveals ecosystem acoustic health and human impact severity.

Illegal activity detection applies AudioMoth to conservation enforcement. Deploy recorders in protected areas to detect gunshots, chainsaw sounds, or vehicle noise indicating poaching or illegal logging. Acoustic monitoring provides evidence of activities and helps target enforcement efforts. This application may require specialized firmware with acoustic event detection.

Marine monitoring through HydroMoth tracks underwater soundscapes. Record fish sounds, marine mammal vocalizations, and boat noise. Underwater acoustic monitoring is growing rapidly as researchers recognize sound’s importance in aquatic ecosystems. HydroMoth makes this monitoring accessible at scales previously impossible.

AudioMoth Open Source Community and Resources

AudioMoth benefits from an active open source community. The Open Acoustic Devices website serves as the central hub for documentation, software downloads, and news. Here you find user guides, firmware updates, and application notes covering specialized uses. The documentation explains technical specifications, deployment advice, and analysis suggestions.

WILDLABS network hosts active AudioMoth discussions. This online community connects conservation technology users worldwide. Search existing forum posts for answers to common questions. Post your own questions when facing unique challenges. Community members include AudioMoth developers, experienced researchers, and fellow users happy to share knowledge.

GitHub repositories contain all AudioMoth design files and source code. Hardware schematics, PCB layouts, and firmware code are freely available. This transparency enables understanding exactly how AudioMoth works. Advanced users modify designs or develop custom firmware for specialized applications. Contributing improvements back to the community strengthens the platform for everyone.

Academic papers document AudioMoth development and applications. The original 2018 Methods in Ecology and Evolution paper describes device design and initial testing. Subsequent publications demonstrate AudioMoth use for bird surveys, bat monitoring, marine studies, and soundscape ecology. These papers provide scientific validation and methodological guidance.

YouTube tutorials offer visual learning resources. Several researchers and organizations post AudioMoth setup guides, deployment demonstrations, and analysis walkthroughs. Video format helps beginners understand physical device handling and software operation more easily than written instructions alone.

Regional user groups operate in several countries. These groups organize training workshops, coordinate bulk orders for discounted pricing, and share region specific deployment strategies. Connect with local groups through WILDLABS forums or social media. Collaborative learning accelerates skill development and problem solving.

Cost Analysis and Budgeting for AudioMoth Projects

Budget planning ensures successful acoustic monitoring projects. Device costs start around $50 for a bare AudioMoth board purchased through group orders. Individual unit purchases from resellers typically cost $60 to $90. Budget quantity discounts may apply for purchasing ten or more units simultaneously. Factor in shipping costs, especially for international orders where duties and fees can add significantly to final price.

Protective cases add $30 to $60 per unit depending on type. The IPX7 terrestrial case costs less than the Underwater case due to different pressure requirements. Some users reduce costs through DIY protection, trading time for money. Budget adequate protection for deployment conditions to avoid losing devices to weather damage.

Batteries and memory cards represent recurring costs. A set of three AA batteries costs $2 to $6 depending on type. Lithium batteries cost more initially but last longer. A 64GB microSD card costs $10 to $15. Calculate battery and card needs based on deployment schedule. Multiple deployments require multiple battery sets and cards, or frequent card swapping and battery recharging.

Accessories add modest costs. Velcro straps, cable ties, desiccant packets, and mounting materials cost $5 to $10 per deployment. USB cables for configuration cost just a few dollars. Consider a field notebook for recording deployment metadata and observations. Waterproof pens or pencils prevent notes from washing away in wet conditions.

Analysis software varies from free to expensive. BirdNET costs nothing. Kaleidoscope requires purchasing licenses at several hundred dollars per seat. R software is free but demands time investment to learn programming. Budget software costs based on analysis approach and available time. Starting with free tools makes sense while evaluating whether commercial software justifies its expense.

Time investment deserves consideration even if not strictly monetary. Learning AudioMoth setup takes a few hours. Deploying devices requires travel time and field work. Data management and analysis consumes substantial time depending on recording volume. A single researcher can reasonably manage five to ten AudioMoth units. Larger projects require additional personnel or automated analysis workflows.

Future Developments and AudioMoth Evolution

AudioMoth continues evolving as an open source platform. The development roadmap includes several exciting directions. Improved hardware versions appear periodically. AudioMoth v1.2.0 improved upon v1.1.0 with better microphone quality and enhanced battery performance. Future versions may include higher quality components, improved weather resistance, or integrated GPS.

Machine learning integration promises revolutionary analysis capabilities. On board processing could enable real time species identification, allowing AudioMoth to classify sounds as they record. This would enable adaptive sampling strategies where detection of rare species triggers increased recording effort automatically. Edge computing approaches could reduce data storage needs by saving only identified target species rather than continuous audio.

Wireless connectivity represents another development frontier. Adding WiFi or cellular capability would enable remote configuration changes, data download without device retrieval, and real time monitoring. These features are valuable but add significant cost and power consumption. Balancing enhanced capability against AudioMoth’s core advantages of simplicity and affordability challenges designers.

Solar power options could enable permanent monitoring stations. Small solar panels and rechargeable battery packs would allow indefinite deployment duration. Early prototypes demonstrate feasibility. Commercial solar AudioMoth systems may emerge as researchers solve engineering challenges around weather resistance and reliable charging.

Specialized variants continue appearing. HydroMoth addressed underwater monitoring needs. MicroMoth serves miniaturization requirements. Future variants might target specific environments like Arctic conditions requiring extreme cold tolerance, or urban installations needing vandal resistant enclosures. The open source design enables community driven hardware variations addressing niche needs.

Software ecosystem expansion will likely continue. More analysis platforms are adding AudioMoth support. Integration with biodiversity databases could enable automatic uploading of verified species detections. Cloud based analysis services might process AudioMoth recordings and return results without requiring local software installation. These services would particularly help users lacking technical expertise or computing resources.

How Often Should You Check AudioMoth Recordings

Checking frequency balances project needs against practical constraints. Initial deployments benefit from early checks within 24 to 48 hours. This rapid feedback identifies configuration errors, audio quality issues, or protection failures before too much time passes. Fixing problems early prevents wasted deployment time. If logistically possible, record a short test file immediately after setup. Listen to this file before leaving the site to verify everything works correctly.

Short term projects lasting one to two weeks can usually skip mid deployment checks. Configure AudioMoth carefully, verify initial recordings work properly, then retrieve the device at project end. This approach works well for intensive surveys covering multiple sites. Minimize site disturbance by avoiding repeated visits. Factor in some deployment failure risk, perhaps budgeting 10 to 20 percent spare capacity.

Long term monitoring stations require periodic servicing. Monthly checks work well for most projects. Replace batteries, swap memory cards, and verify continued operation. Monthly intervals balance maintenance effort against failure risk. Recording gaps from device problems remain brief enough to not seriously compromise datasets. Seasonal weather changes may necessitate more frequent checks, especially transitioning into harsh winter conditions.

Remote locations pose access challenges. Deployments in difficult terrain or distant sites may only allow quarterly or even annual checks. These situations demand careful planning. Use lithium batteries for maximum life. Choose recording schedules minimizing total recording time while capturing target data. Accept higher failure risk as the cost of working in challenging locations. Deploy multiple units at important sites to improve chances of successful data collection.

Real time monitoring needs require different approaches. Projects needing immediate data access must either check devices frequently or develop telemetry solutions. Some researchers use cellular enabled data loggers that transmit recordings to cloud storage. These systems cost more but provide real time data access. Evaluate whether real time data justifies additional expense and complexity.

Document every check visit. Note date, time, battery voltage, card capacity remaining, and any observations about device condition or site changes. This metadata contextualizes recordings and helps identify developing problems. Photos of deployment sites document habitat conditions and mounting arrangements.

Can AudioMoth Help With Bird Species Identification

AudioMoth serves as an excellent tool for bird species documentation and identification. The device’s 48 kHz recording capability captures all bird vocalizations clearly. Most songbird calls and songs fall well within this frequency range. Deploy AudioMoth during dawn chorus when birds vocalize most actively. Recording starts 30 minutes before sunrise captures early singers.

Spectrogram analysis aids visual species identification. Audio software displays frequency patterns over time. Each bird species produces characteristic spectrogram signatures. Experienced birders recognize these visual patterns similar to how they recognize songs by ear. Learning to read spectrograms takes practice but opens identification to people who struggle distinguishing sounds.

Automated identification using tools like BirdNET processes AudioMoth recordings efficiently. Upload WAV files to BirdNET online platform or process locally using BirdNET analyzer. The software scans recordings, detects bird vocalizations, and suggests species identifications. Confidence scores indicate identification certainty. Review suggested identifications and verify questionable calls manually.

Call libraries help confirm identifications. Compare AudioMoth recordings against reference recordings from Macaulay Library, Xeno-Canto, or regional bird sound guides. Match spectrogram patterns and acoustic features between your recording and verified references. This process builds confidence in identifications while developing your own recognition skills.

Detection distance varies by species and habitat. Loud species like crows, geese, or woodpeckers may be detected 100 meters or more from AudioMoth. Quieter warblers or sparrows typically detect within 50 meters. Dense vegetation reduces detection distances compared to open habitats. Understanding detection ranges helps interpret survey results and plan deployment spacing.

Nocturnal migration monitoring captures flight calls of migrating birds. Many species vocalize while flying at night during migration. These calls differ from territorial songs heard during breeding season. Point AudioMoth skyward and record throughout nights during migration periods. Specialized analysis reveals migration timing and species composition of nocturnal migrants.

Species richness assessments use AudioMoth efficiently. Deploy recorders across habitat types or elevation gradients. Standardized recording periods enable comparing species richness between sites. This approach samples birds more completely than point counts, detecting nocturnal species and birds calling outside observer presence times. Long recording periods increase chances of detecting rare or sporadically vocal species.

FAQs About AudioMoth Acoustic Logger

How long do AudioMoth batteries last in the field?

Battery life depends on recording schedule and battery type. Continuous recording at 48 kHz drains three AA alkaline batteries in 7 to 9 days. Scheduled recording extending deployment significantly. Recording just 20 percent of each day can extend battery life to 40 days or more. Lithium batteries last approximately 50 percent longer than alkaline batteries. Cold weather dramatically reduces battery performance, making lithium batteries essential for winter deployments. The configuration app estimates battery life based on your specific settings.

What is the best sample rate for recording birds with AudioMoth?

The 48 kHz sample rate works best for most bird monitoring projects. This setting captures all audible bird vocalizations clearly while keeping file sizes manageable. Some researchers use 32 kHz as a compromise between quality and storage, though this slightly reduces high frequency reproduction. Avoid lower sample rates like 16 kHz or 8 kHz for bird work, as these miss higher frequency components of bird songs. Higher sample rates like 96 kHz or 192 kHz provide no advantage for audible bird sounds while consuming more storage and battery power.

Can AudioMoth record in the rain?

AudioMoth requires weatherproof protection for wet conditions. The bare circuit board is not water resistant. The official IPX7 Waterproof Case protects AudioMoth from rain, humidity, and splashing. The case includes an acoustic vent that maintains sound quality while excluding water. This protection allows deployment during rainy seasons without worry. Some users successfully deploy AudioMoth in sealed plastic bags with desiccant, though this DIY approach provides less reliable protection. For wet or humid environments, invest in proper weatherproof protection.

How far away can AudioMoth detect animal sounds?

Detection distance varies by sound volume, frequency, and habitat. Loud calls like howler monkeys, elephants, or shotgun blasts may be detected over 500 meters away. Typical songbird vocalizations detect within 50 to 75 meters in forested habitat. Ultrasonic bat calls detect from 5 to 30 meters depending on species and call intensity. Open habitats allow greater detection distances than dense forests. Wind and background noise reduce effective detection range. AudioMoth’s signal to noise ratio of 44.2 dB provides adequate detection for most wildlife monitoring applications.

Do I need programming knowledge to use AudioMoth?

No programming knowledge is required for basic AudioMoth use. The configuration app provides a simple graphical interface for setting up recording schedules. Download the app, connect AudioMoth via USB, adjust settings, and start recording. Analysis using software like Audacity or BirdNET also requires no programming. However, programming skills in R or Python enable more sophisticated analysis approaches. Custom firmware development requires programming expertise, but standard firmware serves most users well. AudioMoth’s open source nature offers growth opportunities for users wanting to develop technical skills.

What memory card size is recommended for AudioMoth?

Card size depends on recording duration and sample rate. A 64GB card provides good balance for most projects. At 48 kHz sample rate with moderate recording schedules, a 64GB card stores several weeks of recordings. This matches typical battery life, allowing both storage and power to run out together. Intensive recording at high sample rates benefits from 128GB or larger cards. Cards larger than 32GB require formatting to FAT32 before use. Choose reliable card brands like SanDisk or Samsung to avoid data loss from card failures. Test cards before important deployments.

Can multiple AudioMoth units record simultaneously?

Yes, multiple AudioMoth units can record at the same time. Each device operates independently based on its programmed schedule. Set all devices to the same time during configuration so recording periods align. Standard AudioMoth experiences slight clock drift over time, causing recordings to gradually fall out of sync. For applications requiring precise synchronization like sound localization, use AudioMoth GPS Sync firmware. This specialized firmware synchronizes multiple units using GPS time signals, maintaining accurate coordination even over extended deployments.

Is AudioMoth suitable for underwater recording?

Standard AudioMoth requires modification for underwater use. The HydroMoth variant is specifically designed for underwater deployments. It includes repositioned LEDs visible through the case and a magnetic switch for starting recordings without opening the enclosure. The specialized Underwater Case protects HydroMoth at depths up to 30 meters. This combination enables recording fish sounds, marine mammal vocalizations, and underwater soundscapes. Standard AudioMoth in the Underwater Case also works for shallow water applications, though HydroMoth offers improvements worth the modest additional cost.