The new AudioMoth USB Microphone firmware (AudioMoth-USB-Microphone) allows all existing AudioMoth hardware versions to be used as configurable USB microphones with a sample rate of up to 384kHz.
The most recent versions of the AudioMoth firmware (version 1.8.0) and configuration app (version 1.7.0) introduce two new functionalities: the ability to apply low-pass, band-pass or high-pass filters on the device, and the ability to reduce recorded file size by applying an amplitude threshold.
From firmware version 1.7.0 all AudioMoth devices greater than 1.0.0, and all uMoth and AudioMoth Dev devices, are compatible with external GPS boards which can synchronise acoustic events across devices.
Version 1.4.0 of the AudioMoth firmware introduced a file format for triggered recordings that allows silent periods between periods of audio content to be en-coded within a standard WAV file.
AudioMoth is capable of receiving acoustically encoded data via its microphone. This document describes a robust protocol for this data transfer, called AudioMoth Chime, that is included in the standard AudioMoth firmware from version 1.5.0 onwards
From hardware version 1.2.0 using firmware version 1.5.0 on-wards, AudioMoth is compatible with external electret condenser mono microphones, commonly known as plug-in powered (PIP) microphones.
The AudioMoth micro-controller contains a factory-calibrated temperature sensor. This sensor has not been used in previous versions of the AudioMoth firmware. However, version 1.4.0 adds a temperature measurement at the start of each recording with the results written to the comments section of the WAV file header.
While lightweight ziplock bags can be used to deploy AudioMoth for short periods of time in mild conditions there is a clear need for a more robust solution for long-term deployments. To address this need we have developed a waterproof injection moulded case specifically designed for AudioMoth.