μMoth v1.1 (Round 2)
Open Acoustic Devices
μMoth (“micro-moth”) is the worlds smallest full-spectrum acoustic development board, based on AudioMoth and the Gecko processor range. Just like its namesake the moth, μMoth can listen at audible frequencies, well into ultrasonic frequencies. It measures just 25mm x 36mm and weighs 4 grams. It is capable of recording uncompressed audio to microSD card at rates from 8,000 to 384,000 samples per second. It also shares the same supporting software and firmware as AudioMoth.
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One μMoth v1.1
Campaign active, scheduled end date: Sat, 06 Nov 2021 12:55:00 PDT
300.0 mm (0.98') Micro USB Cable
SanDisk Extreme® microSDHC™ UHS-I w/adapter- 64GB
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This board comes without a case but it will ship in a box ;)
Regarding compression, here's a thorough answer from OpenAcoustics: The AudioMoth doesn’t support any standard compressed format such as FLAC, SHORTEN or X3. We experimented with them and they ended up using more energy than they saved and the file size reduction was pretty small - only about 70% of the original - as the bit resolution of AudioMoth recordings is already less than many recorders.
However, all the models will work with the amplitude threshold recording mode in the standard firmware. This avoids writing sounds below a specified amplitude threshold and encodes the length of any skipped periods allowing the exact sample interval to be restored. For bats this typically yields really big file size savings of between 1 to 10% of the original size.
There isn’t a standard case for μMoth as we expect it to be used in a very wide range of settings with batteries chosen according to the deployment requirements. To date it has been deployed on an African wild dog within a custom housing. It can also be deployed in 35mm film canisters, and as with other AudioMoth models, in a plastic zip lock bag in mild conditions.
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