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yesterday

AudioMoth stopped recording months early

Deployed 19 AudioMoths units over 8 sites in the southern half of the lower pennisula of Michigan. AudioMoths were deployed the end of February, with batteries and memory cards changed out the end of July and all devices collected the middle of November.

Based on the configuration they should of lasted ~150 days.

(Sample rate: 48 kHz; Med gain; Enable sleep/record cycle; 00:04:45 sleep duration; 15 sec recording duration; Enable LED; Enable battery level indicator; 24 hrs/7days recording period = Each day will produce 288 files, each 1440kB, totaling 415 MB; Daily energy consumption approx. 19 mAh).

AudioMoths stopped recording after ~30 days (btwn Feb. 24 and March 29) and after ~60 day (btwn July 22 and Sept. 24).

I was using Energizer Ultimate Lithium AA Batteries and Amazon Industrial Alkaline AA batteries with Amazon basics microSD XC1, 64 GB, V30, Class 10, U3, A2.

Batteries were a couple years…

Recording Issues

45 Views

Cory Redman

5 hours ago

Alex,

Thanks for helping me out with this issue. I haven't been able to create a CVS summary using the 'Summarise AudioMoth Files' option, because it won't recognize my wav. files. Based on my Googling, I need to use the AudioMoth-Utils library to do this, but I have been unsuccessful in making it work, which almost certainly reflects my lack of coding knowledge. If you can provide me with a step by step guide or direct me to an instructional video to accomplish this task, I would appreciate it.

Cheers,

Cory

2 days ago

GPS switched off after 10 seconds

Hi, I'm using AudioMoth Dev with an attached GPS board.

I recorded for about 10 hours (after enabling GPS for time and location setting in the configuration app) and while it produced the WAV files for the whole time, the GPS fixed ("Received GPS fix") only in the first 10 seconds and then was switched off.

Does anyone know what might have caused that to happen? If it managed to fix why should it be switched off?

Perhaps the last three lines in the GPS txt file can help figure this out:

18/11/2025 08:49:52.000 UTC: Time was updated. The internal clock was 81ms fast.

18/11/2025 08:49:52.000 UTC: Actual sample rate will be 15997.206 Hz.

69 Views

Alex Rogers

23 hours ago

Hi Dana,

That's the intended behaviour. The GPS is only powered up before and after each individual recording or recording period in order to update the time. It then switches off to avoid draining the batteries during the recording.

How were you intending on using the GPS data? There is another variant of the firmware - AudioMoth-GPS-Sync - https://www.openacousticdevices.info/gps-sync - which powers the GPS continously during the recordings in order to make recordings that are accurate in time to a few micro seconds.

Alex

Edited

2 days ago

Energy consumption of SD cards

I would like to share some results as a continuation of an earlier post on energy consumption of SD cards at https://www.openacousticdevices.info/support/sd-card-support/u1-vs-u3-microsd-cards-field-data-contradicts-recommendations?origin=notification

We conduct an indoor experiment using Audiomoths with firmware version 1.11.0 in a recording window of 180 minutes. The sample rate is set at 48kHz, and the gain is set at medium. We enable sleep/record cyclic recording. We use daily folders for the generated WAV files. We combined two sets of different recordings and sleep durations with different SD cards and battery models to assess the effect of sleep durations, and the type of card and battery. These are:

Alcaline vs lithium

Lithium batteries do not extend the operating time beyond what alkaline batteries did when the recording schedule was intensive (recording each minute during the 180-minute window). Compare BAU2 vs BAU1.

Recording scheme

SD Cards

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Alex Rogers

2 days ago

Thanks for sharing this information Javier. There definately seems to be an issue with SanDisk Extreme cards which show 'Made in Taiwan' on the back. Alex

Matt

6 days ago

Attempting to configure 20+ Dev units; solid red, flashing green LEDs; config. app not working/ time section greyed-out.

I've got 22 new AudioMoth Dev units, and am attempting to configure them using the MacOS app. After setting the switch to Custom, plugging in the Micro SD card, attaching the power cable from the battery pack in the Dev case, and connecting the USB-micro connection to my laptop (via a USB-C to USB-A dongle, which connects the USB-A end of the USB-micro cable), the green LED flashes every second and the red LED stays solid. According to the LED code key, this should not happen with a new AudioMoth unit.

I've tried several different USB-micro cables including one labeled for both charging and data, restarted my laptop, and so on. The LEDs don't change and the configuratoin app time window is greyed-out.

Any thoughts as to what's going wrong?

No Connection

103 Views

Alex Rogers

5 days ago

Hi, The flashing green and solid LED in CUSTOM mode means that the time has not been set on the AudioMoth and it is waiting for the acoustic chime to be played from the smartphone app to set the time. Once this is set, the AudioMoth will then start following the configured settings. If you switch to DEFAULT, the AudioMoth will make a continous recording with the current settings even if the time has not be set. To configure the AudioMoth to a specific configuration and to set the time, using the Config App, you need to switch to USB/OFF and then the AudioMoth will connect to you computer via the USB cable.

There is a quick setup guide here:

https://www.openacousticdevices.info/setup-guide

Alex

Edited