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

Is it possible to modify the firmware so that the data stored on the SD card can be accessed via USB connection, instead of removing the card from AudioMoth and connecting it to a PC with a card reader?

Hello Open Acoustic Devices,

We ran into an issue during one of our 2-week-long deployments where the Audiomoth stopped recording after 2 days despite having enough battery and SD card storage to last 2 weeks. The Audiomoth configuration was at a sampling rate of 192kHz, a 5min ON 5min OFF sleep/cycle scheme for a 24hr recording period.

It was placed within an Audiomoth dev case and the battery connections have been checked. We are using 3 Paleblue D cell rechargeable batteries. And the microSD card is a 256GB Sandisk Extreme UHS Speed Class 3 (U3) microSDHC card. The SD card was reformatted to exFAT before being used.

Below I will attach the SUMMARY.CSV and a picture of the Audiomoth inside the dev case. The Audiomoth was recording (flashing red) at time of deployment and we recovered it a week later under an error mode (green and red flashing). When using…

Hello Open Acoustic Devices,

I wanted to get some clarification on a problem we have observed when using the Audiomoth to collect recordings in an outdoor natural area. We sample at 192kHz, 300s/300s record/sleep cycle, and equip our Audiomoths with 6 or 9 AA rechargeable batteries.

We have noticed that our Audiomoth sometimes changes mode during deployments and produces "empty" 488-byte files that do not contain data and are short. It goes into this mode and might generate 100s of such files and then comes back to generating normal files.

I am attaching a couple screenshots from previous deployments of the file explorer view alongside an exiftool-based readout of the file metadata. You can see the normal files will be generated before and after the error "488-byte" files. These problems persist in the same manner even to this day with new firmware and new Audiomoths.

I can generate a SUMMARY.CSV…

Hi, after formatting my SD-card on my Mac, my HydroMoth doesn't read it anymore (flashing both green and red at the same time). It does still read other SD-cards, so no device problem. How can I make my SD-card work again for the HydroMoth?

Hi everyone,

I got all my recordings with this kind of noise (in picture) on a Hydromoth Firware Basic 1.11.0. We used SD card SanDisk Extreme 64 Go.

Could it be the SD card when is writing? Do you have any recommandations?

Thanks,

Hi,

I recently bought 2 AudioMoths and 2 SanDisk Extreme 64GB Micro SD cards. One AudioMoth has configured with no problem at all and is working as expected. The other AudioMoth, upon configuration, blinks green, but when the scheduled recording starts while in CUSTOM mode, or when I attempt to record in DEFAULT, there are 4 long green and red flashes, before intermittently flashing green and red. No recordings are made.

The diagnostics page here (https://www.openacousticdevices.info/led-guide#:~:text=Both%20lights%20flashing%20(100ms)%20on,a%20recording%20being%20cut%20short.) suggested that, when this happens in either CUSTOM or DEFAULT, it is an ´SD card write error or low battery´.

I have changed all batteries to new and functioning batteries and this has not resolved the issue. I have also:

• Tried the SD card in the other AudioMoth, where the other AudioMoth worked without any problems, suggesting to me the SD card is not defective

• Tried a functioning SD card in the AudioMoth which…