I have a handful of new devices and followed instructions to configure.
However, the devices are not recognized by my computer. I tried 3 different USBs, two different audiomoths, many different USB ports, and two different computers. When I plug it in (setting is USB/Off) the green light appears, so it seems something is happening but nothing shows up on my computer. Thanks for your help!
Hi,
I ordered one audiomoth (Labmaker, Germany) May 2025, version 1.2.0,
flashed it with 1.11.0 (can't remember if I had to switch off the USB HID flashing, I think I needed to). This one is working perfectly, recording already for two months now in the field.
End of sept 2025 I ordered 2 extra Audiomoths 1.2.0. Flashed to 1.11.0 (needed to switch off USB HID flashing for both). Configuration with same .config as first one. But for both a lot of electronic noise is heard, the spectrogram shows horizontal lines at 4, 8, 12 kHz and sounds seem to repeat in between. I tried downgrading to 1.10.0, but the problem was the same. What is your advice?
Hi,
These have a hardware manufacturing problem affecting the external SRAM chip. That’s why the USB HID flashing doesn’t work (the firmware is written to the external SRAM and the checksum compared before it is applied to the flash). It looks like a data line or adddress line has a bad connection. Can you post a WAV file here and I can check.
If you install the AudioMoth USB Microphone firmware you’ll find that they appear to be working okay then as that firmware doesn’t use the external SRAM.
Ask LabMaker to send you replacement devices.
Alex
Hi,
Can anyone tell me what i need to change that the moth will start recording immediately without any set time. (only recording period is set once - to limit the filesize) It could name the files like 1.WAV, 2.WAV or so. i dont need a timestamp and the setting of the time only complicates deployment. GPS only needs battery...
The next thing i'd like to know is why this device "looses" its firmware sometimes if the battery is disconnected for some time.
Thanks in advance
Phil
Hi Phil,
If you switch to DEFAULT the AudioMoth will make a continuous recording with the current configured recording settings (gain and sample rate) without having to set the time.
If you use the GPS board with the AudioMoth, it will set the time from the GPS board when you switch to CUSTOM so you don't need to set the time then either.
The AudioMoth shouldn't lose its configuration or firmware. Both are stored persistently in flash memory. If you remove the battery however it will lose the time, so you will need to set the time with the Time App or smartphone app prior to recording.
Alex
Hi everyone,
when reading the documentation on Github I see that the sampling rate is capped at 192 kHz for use with the dedicated GPS sync FW (https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings.pdf). When I look at the sample SETTINGS.txt (https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings/SETTINGS.TXT) provided the parser seem to enforce 125 kHz. I am interested in recording bats and localizing them with synced MicroMoths and I was hoping to use a sampling rate of 384kHz. Is it not possible to sample that high when using the GPS hat?
Best wishes,
Felix
Hi Felix,
The maximum sample rate for AudioMoth-GPS-Sync is 192kHz. I've updated the example file. The AudioMoth doesn't have time to do the necessary processing at 384kHz.
However, you can make synchronised GPS recordings with the standard firmware at 384kHz. The synchronisation is typically then only +/- 1 ms rather than +/- 1 us. The application note below describes this approach:
We have an update coming out in the next few months that might improve this to about +/- 0.1ms.
Alex
Thanks for the message. Is the AudioMoth Configuration App clock greyed out when plugged into USB or are the seconds ticking?
What operating system were the computers you tried?