AudioMoth | Open Acoustic Devices

audiomoth

AudioMoth

AudioMoth is a low-cost, full-spectrum acoustic logger, based on the Gecko processor range from Silicon Labs. Just like its namesake the moth, AudioMoth can listen at audible frequencies, well into ultrasonic frequencies. It is capable of recording uncompressed audio to microSD card at rates from 8,000 to 384,000 samples per second and can be converted into a full-spectrum USB microphone.

EFM32 Gecko processor
Capable of recording at sample rates up to 384kHz
Records uncompressed WAV files to microSD card
Can be converted into a full-spectrum USB microphone
Powered by 3 x AA batteries
Analog MEMS microphone
Analog pre-amplifier with adjustable gain
Measures just 58 x 48 x 15 mm
Configurable USB interface
Onboard real-time clock keeps track of time in UTC
Exposed header for 3.5mm jack mic from version 1.2.0 onwards

Click Getting Started for help setting up a new AudioMoth.

A manual containing all AudioMoth information for offline use is available here.

HydroMoth

HydroMoth is a variant of the standard AudioMoth specifically designed to be deployed in the underwater case.

Re-positioned LEDs for improved visibility in the underwater case
Improved 32.768 kHz MEMS oscillator to reduce clock drift
In-built magnetic reed switch, which enables recordings to be started and stopped in wet conditions without opening the case.
Compatible with all AudioMoth software

An application note containing examples of HydroMoth deployments is available here.

AudioMoth Dev

AudioMoth Dev is a variant of the standard AudioMoth 1.2.0 designed as a development board for skilled users to integrate into other boards and products.

Power socket (JST-PH) supporting 3.7 - 6V batteries
All controls, indicators and IO ports broken out to 5 JST-PH style headers
3.5 mm jack socket for external electret condenser microphones
Compatible with all AudioMoth software

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The AudioMoth Dev datasheet is available here.

audiomothdev

MicroMoth

MicroMoth is a micro-size variant of the standard AudioMoth 1.1.0 open-source design, while maintaining full compatibility with all versions of the existing firmware.

Power socket (JST-PH) supporting 3.7 - 6V batteries
Measures just 32 x 24 mm
Weighs just 5g (excluding battery)
Compatible with all AudioMoth software

The MicroMoth datasheet is available here.

umoth

USB Microphone

AudioMoth USB Microphone

AudioMoth USB Microphone is a variant of the standard AudioMoth 1.2.0 design which removes many of the components which aren't needed when an AudioMoth is being used as a USB microphone. It's designed to specifically run the AudioMoth USB Firmware and uses an identical audio front-end to the AudioMoth 1.2.0 and AudioMoth Dev variants.

3.5 mm jack socket for external electret condenser microphones
Supported by Windows, Mac, and Linux (including Raspberry Pi)
Measures just 40 x 35 mm
Compatible with the AudioMoth USB Microphone firmware and

the AudioMoth Live App

An application note describing the use of the AudioMoth USB Microphone

is available here.

How to buy

Cases

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IPX7 Waterproof Case

The AudioMoth IPX7 Waterproof Case is designed specifically for AudioMoth (without the 3.5mm socket). It can also be used with HydroMoth. The case is made from injection-moulded polycarbonate and comes with an adjustable velcro strap, which makes securing AudioMoth simple and easy. The case is compact and resilient and will house AudioMoth for extended periods of time in a wide variety of terrestrial environments.

Injection-moulded polycarbonate protective case
Sealed using an easy-to-use clasp and compression o-ring
Rain hood designed to prevent water pooling
Opening protected by a waterproof GAW334 acoustic vent
Comes with a removable adjustable velcro strap
Available in green

An application note describing the IPX7 Waterproof Case

is available here.

Underwater Case

The AudioMoth Underwater Case is designed specifically for HydroMoth. It can also be used with AudioMoth (without the 3.5mm socket). While all versions of AudioMoth will fit inside the case, we recommend version 1.2.0 to minimise self-noise in recordings. The case is made from injection-moulded polycarbonate and comes with an adjustable velcro strap, which makes securing AudioMoth simple and easy. The case is compact and resilient and will house AudioMoth for extended periods of time at depths of 30-60m.

Injection-moulded polycarbonate protective case
Sealed using an easy-to-use clasp and compression o-ring
Submersible underwater case
Tested to a depth of 30m for 2 months
Comes with a removable adjustable velcro strap
Available in frosted transparent

An application note describing the use of the Underwater Case

is available here.

AudioMoth USB Microphone Case

The AudioMoth USB Microphone Case is designed specifically for AudioMoth USB Microphone. The case is made from injection-moulded polycarbonate with an accessible polycarbonate switch, protecting the device during hand-held applications.

Injection-moulded polycarbonate protective case
Opening protected by a splashproof GAW112 acoustic vent
Available in green and blue

An application note describing the use of the AudioMoth USB Microphone

Case is available here.

AudioMoth Dev Case

The AudioMoth Dev Case is a waterproof injection moulded enclosure for AudioMoth Dev that supports full hardware configuration flexibility, with integrated mounts and slots that enable the use of external microphones, GPS, large batteries and custom auxiliary boards.

Injection-moulded polycarbonate protective case
Sealed using two easy-to-use clasps and compression o-ring
Rain hood designed to prevent water pooling
Opening protected by a waterproof GAW334 acoustic vent
Comes with two removable adjustable velcro straps.
Comes with D-cell battery holder and connecting cable
Slot available for the AudioMoth GPS Board
Slot available for custom 26 x 24 mm auxiliary board
M16 cable gland opening with installed cap

An application note describing the AudioMoth Dev Case

is available here.

Accessories

AudioMoth GPS Board

The AudioMoth GPS Board is a hardware module that extends AudioMoth with a connected GPS module and magnetic switch. The AudioMoth GPS Board comes in two variants, using different GPS modules: the PA1616S module that uses GPS satellites only, and the PA1616D module that uses both GPS and GLONASS satellites.