AudioMoth is a low-cost, open-source acoustic monitoring device that can record uncompressed audio from 8000 up to 384,000 samples per second onto a microSD card. With sensitivity to audible sounds as well as ultrasonic frequency range, It is mostly used for monitoring wildlife including bats, cicadas, the rainforest, etc…
The manufacturer, Open Acoustic Devices, is now offering the development board version with AudioMoth Dev, based on a Silicon Labs EFM32 Wonder Gecko MCU like the full device, for $79.99 + shipping on GrougGets.
- Wireless microcontroller – Silicon Labs EFM32 Wonder Gecko Cortex-M4F MCU @ 48MHz with 256kB Flash, 32kB RAM
- External RAM – 256kB SRAM
- Storage – MicroSD card slot
- Audio capture
- On-board analog MEMS microphone, sensitivity -38 dBV/Pa, 63 dBA SNR, 10Hz to 192kHz
- Sample rates up to 384kHz
- 3.5 mm jack socket for external electret condenser microphones (Note: the optional case not compatible when using an external mic)
- USB – Micro USB B port for power, configuration, and for reprogramming the flash
- 4-pin header for multi-function 3V General Purpose I/O (GPIO)
- 3-pin header for external red and green LED’s
- 3-pin header for an external switch
- Debugging – 6-pin serial wire debug port
- Power Supply
- 2-pin header for external power supplies/batteries (3.3V to 6V)
- 2-pin header for powering external 3V boards or products from AudioMoth Dev
If you’d rather not make your own case, which could be a zipped bag, the official AudioMoth IPX7 waterproof case is also offered on GroupGets for $34.99. It is designed to handle up to one-meter submersion for one hour with no leakage, comes with a Velcro strap for easy deployment on 3-6 cm diameter branches/poles, and a clasp for simple battery and MicroSD card changes.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.