Just got my trial AudioMoths and don't understand the LED flashes that I am getting. I double-checked the configuration and this seems fine (8kHz sampling rate, schedule 00:00 to 23:59, gain 'low').
- one unit is flashing green every 2 seconds for 7 repeats, then a quick long green flash. This appears to be signaling a full micro-SD. I reformatted and it is behaving like the one below.
- one unit is flashing red at a similar interval, then after 5 repeats a short green flash and a pause of about 4sec, then red again.
if this one is switched to 'default' it resumes the same flashing sequence as above.
It would be good to update the 'getting started' with a full description of LED status indicators.
Just tested several Audiomoths in different housings. It is clear that disabling the LED doesn't have an impact on the clicks mentioned above. Like Andy stated, it is likely to be the writing to the SD cards. Unfortunately those clicks are much more present when put in a case. The plastic bag is intermediate and without any protection it is negligible.
Recording in tropical conditions require adding some housing. We hope this can be solved in the next batches....
Sorry to hear that you had a poor session with the case. If it rains it could be worth trying the case again. Sometimes the microphone can miss-align with the drill hole so it's good to double check everything is aligned correctly before deploying.
Thanks Andy. I had a poor session when using my second moth in the acrylic case that came with the BCT pilot scheme. Thousands of 'Soprano Pips' that just were not there. Haven't experienced this with the original moth.
Great, thanks for checking that. The clicks you are seeing are SD writes that sometimes are amplified when AudioMoth is deployed in a grip sealed bag with low-level background noise. If you need more clarity in the recording I would suggest recording without the grip-sealed bag for now (if not raining). We will be releasing a low-cost acrylic case soon for outdoor recordings. The 18kHz and 40kHz represent the frequency response of the microphone, a lot of recorders have these bands centred at varying frequencies.
Andy: Not as much of an issue (as far as I know) but any idea about the smears at c. 18 kHz and c. 40 kHz as well? They seem to be intrinsic to the device as I've had them in recordings made 20 miles apart.
Thanks for getting back Andy. I'm using SanDisk Extreme 32GB. I tried it in a ziplock bag and without an enclosure. It seemed perhaps a bit worse in the bag. With the LED off it's still there but less noticeable. [And on 'default' the LED still flashes when configured 'off' (but not on 'custom').]