©2019 Open Acoustic Devices

AudioMoth

Frequently Asked Questions

Common queries and issues

  • I just got my AudioMoth, do I need to flash it?

    • If you plan on producing constant recordings or recording on a schedule, no. When you purchase your device through a GroupGets group purchase or directly from CircuitHub, then it will come equipped with stock firmware which will cover your needs.

    • Just follow the configuration app guide, plug in your AudioMoth and you're ready to go.

    • If you wish to implement additional functionality on the device, you'll have to alter firmware provided on the resources page and flash it using our guide.

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  • How are AudioMoth recording files named?

    • In order to make opening files on the device as quick as possible, filenames are limited to 8 characters (longer file names are handled by maintaining a lookup table of filenames). These 8 characters are used to express the time of the recording as a UNIX timestamp (the number of seconds since the UNIX epoch at 0:00 01/01/1970) in hexadecimal.

    • For example, the file name "592D42A3.wav" can be converted from hexadecimal to decimal to produce the timestamp 1496138403. This timestamp in turn, can be converted to 30/05/2017 at 10:00. You can either use this conversion process or simply use the "Date Modified" property for each file.

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  • Why does the configuration/timesetter app claim it's 01/01/1970?​

    • AudioMoth possesses an inbuilt clock which ticks up every second from a start time. When an AudioMoth is configured using the app, the start time is matched with the computer clock. As it isn't possible to increment the clock when the device has no battery power, it defaults to the number of seconds since the UNIX epoch until it is set.

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  • How do I calculate the battery lifespan?​

    • First check the capacity of the batteries being used (provided on the packaging in mAh). To calculate how many hours the batteries will last for, divide this battery capacity by the daily energy consumption given in the configuration app.

    • For example, Energiser Ultimate Lithium batteries possess a capacity of 3600 mAh. With a daily energy consumption of 102 mAh, three Energiser Lithium batteries should operate for 3600 / 102 = 35 days.