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Duncan Hoyle

Audiomoth 1.0.0

I have an old 1.0.0 AudioMoth which I haven't used for a while (since I got a couple of newer ones a few years ago). Since one of the newer ones appears to have water damage to the Mic (constant static on recordings and the same when flashed with the Mic firmware and listening on the PC) I've been trying to use the older 1.0.0 AM. Is it be compatible with the latest firmware and configuration apps, as I've tried several firmware versions. The LEDS both flash continuously - 5 longer paired flashes and then continuous shorter paired flashes. This is with a couple of different SD cards (64GB and 32GB) and with freshly charged batteries. Any suggestions?

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Alex Rogers
Alex Rogers
3 days ago

Hi Duncan,

Yes, it will be compatible with all the firmware. You can't use an external microphone or the GPS hat but everything else will work fine. Try the most up to date version and switch to DEFAULT. The LED flashes you are seeing is an SD card write error. Double check that the SD card. Alex

Tyler C
Tyler C

AudioMoth loosing configuration after 3 days

Hi, I am doing a long-term acoustics study with 10 recorders. Every 5 days, batteries and SD cards are changed and recorders are rotated between locations. SD cards are recalibrated every 5-day period. I use the Chime app when turning Audiomoths on.


Configuration settings:

  • 32 kHz

  • med gain

  • scheduled 90 min before sunrise to sunset using GPS coordinates


When I check the SD cards, they have been recording correctly for the first 3 days of data collection, but on days 4 and 5, only the first 10-15 min (averaging at 13 min) after sunrise has been recorded. This has been happening to all 10 audiomoths for multiple weeks despite reconfiguring every 5 days.


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Alex Rogers
Alex Rogers
4 days ago

Hi Tyler, Can you use the 'Summarise Audiomoth Files' option under the 'Process' menu in the Config App to generate a summary of one of the SD card's contents. It looks like the files are getting smaller which is indicative of the batteries running down and the AudioMoth stopping the recordings early. However, the file sizes in the screenshot look a bit strange. If you open one of the files in AudioMoth Play and check on the 'File Information' the WAV header will describe why the file is shorter than requested. What make and model of batteries and SD cards are you using? Alex

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Yasemin Schutter
Yasemin Schutter

Recording failure: empty SD card and red/green LED

I ran into an issue during one of my AudioMoth deployments where the recorder did not make any recordings.


The AudioMoth was configured in CUSTOM mode with a recording schedule from 18:00 to 06:00. The same AudioMoth and the same schedule had worked correctly during the previous deployment week. I did not change the CUSTOM switch position between deployments.

For this deployment, I used a new SanDisk Outdoors FHD 64 GB microSD card, the same type of card that I had successfully used before. The batteries were also replaced before deployment.


After retrieving the AudioMoth, the SD card was completely empty and contained no WAV files or summary files. I also observed a red and green LED on the device, which seems similar to other reported cases of recording failure or SD card write errors.


Based on the LED behaviour and the empty SD card, I suspect this may have…


SD Cards
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Alex Rogers
Alex Rogers
4 days ago

Hi,

The blank SD card is almost certainly caused by the AudioMoth waiting for the acoustic chime and never actually starting the recording sequence. It would have been showing a constant red LED and a flashing green LED. The safest sequence is to switch back to USB/OFF so that if the AudioMoth is recording it can close the current file. Change the SD card and change the batteries. The AudioMoth will then have lost the time but still retained the configuration which is permanently stored in the microcontroller. To set the time you can either use the Time App on your laptop and connect via USB. This will update the time and leave the configuration unchanged. Once the time is set, switch to CUSTOM and the AudioMoth either immediately start a recording (depending on the schedule) or wait for the next recording showing a flashing green LED every two seconds. Altenatively, switch to CUSTOM immediately and the AudioMoth will start listening for the acoustic chime whilst showing a constant red LED and a flashing green LED. Play the chime from the AudioMoth. You can try repeatedly as it takes a couple of goes to get the volume and distance correct. If the time is correctly received, the green LED will light for a couple of seconds, and then the schedule will start as above.


You can also set a location with the acoustic chime and this will be added to the GUANO metadata in each WAV file. Alex

aliparesalipares

Reef recordings

Hi,

I'm about to start a new project, part of which requires some recordings of coral reefs. Have any other users used Hydromoth for this purpose and how was the experience? Would I need anything from open acoustic devices beyond the Hydromoth and the housing? I'm UK based


Thanks!

Ali

116 Views
Alex Rogers
Alex Rogers
May 01

Hi Ali, The best reference is this paper: https://zslpublications.onlinelibrary.wiley.com/doi/10.1002/rse2.249 You would need to figure out some way to mount the HydroMoth. Some groups have used weighted posts or stakes. For shorter deployments, strapping a dive weight to the housing seems to work well: https://www.dropbox.com/scl/fi/rfz7c5gmbcqpy94g64clg/Our-Changing-Planet-HydroMoth.mp4?rlkey=jmvr9ruraccf53y9soezku9d9&dl=0


The magnetic fobs are useful in the field as you can configure and close up the HydroMoth in a nice clear dry environment and then activate them in the field with the magnet: https://www.openacousticdevices.info/product-page/hydromoth-magnetic-key-fob Alex


Edited

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