Hello there (Alex maybe ?)
I bought a second hand HydrMoth. It was working normally for some tests. Then it stoped recording anything. - I had to upgrade the firmware from 1.8.1 to 1.9.0 to get the magnetic switch working. - The board is marked 1.0.0 - Code-bar : res 25 nov. 2023 16:43 CODE_39 => 10414533 - SD card SanDisk Extreme 64Gb (I tried two of them) - Batteries AA Alcaline (new, 4.6 V displayed by the App
- GP REcyclo 2600mAh fully charged
The SD only contains some background noise (see attached recorder WAV). - Yesterday the noise was huge (see 20231124_155900.WAV).
- Today, this noise is very low (see 20231125_152720.WAV) - Nothing of the sounds to be records are recorded, even when testing on my desk. - I tried in different rooms of my house.
- The Live App does show the sound spectrogram, but its Capture contains the same noise than using DEFAULT or CUSTOM settings. See "2023-11-25-record problem.png", "2023-11-25-report1.png" and "20231125_152720.WAV"
Following me, there is an hardware problem. It looks like the SD writing works but the sounds are not recorded on it.
However, il is possible that an unusable very low trace of the sounds are recorded in a corrupted way (I hit my desk with a pencil close to the device).
Any ideas about how to fix this problem ?
Best regards
Pierre
Hello Alex, 1) I ran a test as yesterday to reproduce the problem (Live App at 48 kHz). The result a OK and the record also !!! I do not understand. The problem seems erratic ??? 2) I flashed Firmaware Micro USB 1.2.2. Everything was OK included the Captured WAV file... => It looks like the micro is working well.
3) I flashed v1.9.0 + same configuration as yesterday + using CUSTOM and magnetic switch. - The LEDs were flashing the right way. - Same result as yesterday. Only some tiny noise recorded. => I think that the problem is on the SD recording side...
4) I reproduced the test Nb 2) with the same results (OK at any sample speed till 384 Hz) 5) Note : you were right that with v1.9.0 Live App was recording from my Webcam at 48 kHz. Sorry, I did undestood that. Do you have a final diagnostic ? What to do next ? Thanks a lot for your help. Great ! Pierre
Thanks a lot for your fast replay Alex :-) >This is either a microphone problem or an SD card write problem. If it is a microphone problem the Live App should not shouw the spectogram I think. Right ? >The easiest way to check is to install the AudioMoth USB Microphone firmware, switch to CUSTOM and launch AudioMoth Live. I wil do this test the USB Microphone firmware tomorrow (it's night now here in Belgium) >This text will show 384kHz AudioMoth USB Microphone when recording from the HydroMoth. >Check if captured WAV files from the AudioMoth Live app have the same noise. Yes it was the same pronblem when recording at 192 kHz. All test I ran with the HydrMoth are with 192 kHz (on the desk or into the water (recording a pinger which is transmiting ultrasounds). The project is to record orcas next year. I wil try the >However, the data within the files doesn't look like random noise which is strange. >Have you tried reformating these SD cards to FAT32 or exFAT before making a test recording? Yes. I formated the two SD in exFAT.
Best regards Pierre
Hi Pierre, This is either a microphone problem or an SD card write problem. The easiest way to check is to install the AudioMoth USB Microphone firmware, switch to CUSTOM and launch AudioMoth Live.
The AudioMoth Live screenshot you show is capturing audio from your laptop's microphone rather than the HydroMoth.
This text will show 384kHz AudioMoth USB Microphone when recording from the HydroMoth. Check if captured WAV files from the AudioMoth Live app have the same noise. If you see the same interference there it suggests that the microphone has possibly suffered some water damage. However, the data within the files doesn't look like random noise which is strange. Have you tried reformating these SD cards to FAT32 or exFAT before making a test recording? Alex