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Recording Issues (14)

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USB Microphone (4)

6 hours ago

Stopped recording despite space on SD card and charge in batteries.

Hello,

Last year, I purchased 20 AudioMoths via GroupGets. I deployed them for 2 months at a site Feb - Apr 2025, each in the weatherproof cases. I configured them to record at a sample rate of 48 kHz and 16-bit depth, with bursts of 1 min recording periods, then 4 mins of sleep 24/7. We changed the batteries mid-way through, using the chime app to reset date/time, and upon review of the devices, the batteries lasted for 3 weeks (AA Ni-MH 1.2V 2400mAh). 256GB SanDisk Ultra SD cards were used. All went smoothly, and recordings were as expected.

This year, I have come to repeat my survey, following the same protocols as the previous year (other than accidentally using 4 min burst of recording with 1 minute of sleep!). Upon reviewing the SD cards, not a single device has recorded as expected. Some have no recordings at all, whilst…

Recording Issues

26 Views

Alex Rogers

4 hours ago

Hi Abby, Can you use the 'Summarise AudioMoth Files' option under the 'Process' menu in the Config App to generate a summary of the contents of one of the SD card. The 256GB SanDisk Ultra SD card use about 3-4 times the energy of the 32GB SanDisk Extreme card that the Config App uses for the energy calculation so you may just be running the batteries down much faster with the four minute recordings.

Were the SD cards reformatted before use, or were the files just deleted from them? If the latter, that may be the reason as AudioMoth cannot recover the space in the file allocation table in realtime.

Alex

Lå Andersson

21 hours ago

No files on devices

Hi, I have a Audiomoth dev 1.0 and I try to program in the same way as 1.2.0 But I didnt get any soundfiles on the sd-card. Either I didnt get any lamp to lightened. Do you have any suggerstion?

Lars

41 Views

Alex Rogers

20 hours ago

Hi Lars, AudioMoth Dev will work the same as the standard AudioMoth if the same firmware is installed. Can you check with the Config App or the Time app, which firmware is installed. How are you powering the AudioMoth Dev? What make and model of SD card are you using? Alex

Edited

22 hours ago

USB cable entry provision on the usb microphone case

Hi Folks,

I can't find anything describing the provision of a cable inlet on the usb microphone case. It seems that it must have such a thing, or else the case would be a bit useless! Can anyone help me find out what sort of size cable can be used with the case?

My intended application is for providing audio for a bird feeder stream that is currently coming from a USB camera mounted indoors, pointed out a window.

I'd like to see if I could use a flat USB cable to pass through the window frame to an audiomoth usb mic outside, then into a hub and onto a USB extension cable to the streaming encoder pc.

USB Microphone

43 Views

Alex Rogers

21 hours ago

Hi Zaphod,

The USB microphone case isn't fully waterproof - there is no seal on the housing and the switch, USB and 3.5 mm jack sockets are exposed. It's really intended for attended deployments whilst doing bat or hydrophone surveys.

Lots of people do deploy them anyway, and just seal up all the potential leak spots.

You could place the AudioMoth USB Microphone (or AudioMoth Dev or standard AudioMoth with a 3.5mm socket), into a regular waterproof enclosure, and use the the AudioMoth external microphone (https://www.openacousticdevices.info/product-page/audiomoth-external-microphone). This is fully waterproof with an acoustic vent and fits a 16 mm hole.

An (larger) alternative would be the AudioMoth Dev PCB in the AudioMoth Dev case, with a cable passing through the 16 mm vent hole in the base.

A fully-waterproof AudioMoth USB Microphone case is on the development list.

Alex

Edited

22 hours ago

Battery draw down when in USB/off mode?

I am wondering if anyone has specifics (other than minimal draw down) at the rate of draw down on batteries when units are in the USB/off mode? I am deploying 40 units in a couple weeks. They are going to be deployed in really remote areas, so we'd like to get as much as we can out of the batteries, but at the same time, I'd like to get all the units set up and not have to install the batteries in the field.

USB Microphone

47 Views

Andy

6 hours ago

This might be relevant. Once AudioMoth is initially configured the settings are persistent and only the time needs updating before subsequent deployments. If AudioMoth accidentally loses time during the trek to a deployment, you can then simply use the AudioMoth Chime App for smart phone to set the time in the field, this is really useful for maintenance visits and battery changes too.