Files with 0kb

@Alex Rogers mas eu acho que não é o aparelho, por que se fosse ele nao gravaria nada no outro cartao (Sandisk ultra). Ele tem pilhas instaladas, eu vou trocar novamente as pilhas e ve o que acontece.

@Alex Rogers eu usei recentemente o aparelho usando o antigo cartão, e gravou normalmente nos primeiros 15 minutos.

@Michael Bruno Yes, I don't really understand what is happening here. Recording a small number of files and then writing 0KB files is generally a sign that the SD card is full (often with hidden files that don't show up on your computer) and needs reformatting. Is the content of the files that the Sandisk Ultra records okay? If you record your voice, does it appear in the recordings correctly? I would try reformatting the Sandisk Ultra card in either FAT32 or exFAT - the opposite of whichever it is already.

Eu configurei para exfat. Porem o cartão antigo (Sandisk ultra) gravou 15 minutos e apos este tempo fica 0kb. Já o cartão novo (Sandisk extreme) não grava obsolutamente nada. Nao aparece nem 0kb. Não aparece no cartão nem o arquivo CONFIG

@Michael Bruno Can you describe what the LED do in this case? A long flash of both red and green LED indicates an SD card write error. For the SD card that is recording, do the files sound okay? If you record your voice, can you hear your voice in the recordings clearly with no interference?

Can you also post one of the files here so I can read the WAV header comments.

No. We recommend the Sandisk Extreme - https://www.openacousticdevices.info/sd-card-guide

I think Sandisk Ultra card may be too slow to record at 384kHz - it will likely not be able to keep up with the AudioMoth. Make a recording of yourself counting to ensure that the resulting recording is okay. We recommend Sandisk Extreme cards for high sample rates as it is a U3, rather than a U1, card and has low power consumption. I don't think that is the problem here though. I think the file allocation table on this card is full and would be restored by reformatting. Double click Computer on the desktop to open Windows File Explorer. Right click the SD card and select Format…. In the pop-up window, choose FAT32 under File System tab. If the card is greater than 32GB, Windows 7 may not let you choose FAT32 so choose exFAT instead.

@Alex Rogers entao, eu fiz o que voce me passou, mas o cartão a estava em ex-FAT. Formatei, mas o problema continua. Entao voce acha que tenho que adquirir outro cartão do tipo Sandisk extreme.?

@Michael Bruno

If you record your voice speaking, is the recording okay with no skipped sections?

It would be worth trying another card. Do you have more than one AudioMoth so you can see if the problem follows the SD card?

I don’t think the speed of the card will cause this issue but you could try recording at 48kHz instead and see it the problem persists.

What batteries are you using? Is it possible for you send me, or to post somewhere, the last recording that the AudioMoth made so I can see the battery voltage.

I doubt it is a battery issue as normally the files are shorten, rather than stopped. In this case, the AudioMoth opens each file, but the writing of the file fails at some point, so the file is not closed and it has very length.

i think this is a problem with the SD card, or because the SD card is full and needs formatting. If formatting didn’t fix it, try a different SD card. Sandisk Extreme work really well with AudioMoth.

Ah. To work correctly on Windows 7 you need to manually install the USB CDC Serial Port driver. Later versions of Windows and all other operating systems automatically include the driver. There is a sequence of instructions here that should guide you through the process - https://www.openacousticdevices.info/support/main/comment/5bd1eb4b3df870002e872778

@Michael Bruno What version of Windows is this?

What version of Windows is this? This seems to be a problem with the serial interface - it tells the AudioMoth to switch and then can't see the standard bootloader. Is it possible to try on another computer?