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AudioMoth Housing
In Enclosures
greghall
Aug 11, 2017
In my experience, it's all but impossible to keep condensing moisture out of equipment, especially in tropical forests. Better to provide very good protection against rain and splashes, and a generous area of finely-screened ventilation below, so the inevitable accumulation of dew can be evaporated away when the day warms up. Probably needless to say, the PCB must be well lacquered, and all external contacts well lubricated to displace corrosion-causing moisture and electrolysis. (I like lanoline-containing sprays, they are slow to evaporate) The area of (stainless-steel) wire mesh will also provide an ample area for the ambient sounds to get to the microphone, rather than depending on a tiny hole with an occluding membrane. The microphone specified for 'our' device on page 6 of http://datasheet.octopart.com/SPM0408LE5H-TB-Knowles-Acoustics-datasheet-14433657.pdf is a bit vague about environmental tolerance, although page 3 of http://datasheet.octopart.com/SPM0408LE5H-TB-Knowles-Acoustics-datasheet-10100519.pdf shows it to be a tough little beast. Incidentally, it seems to be only specified up to 10kHz. The ultrasonic sensor on page 3 of the first catalogue is charted up to 100kHz, but its response does change quite a bit over that range. It would be very helpful to see a sweep plotted up to 250kHz. All that said, I like hundreds of others, are champing at the bit to get experimenting with our AudioMoths! Regards Greg Hall PS: These piezoelectric microphones may be worth paying attention to: http://www.tomshardware.com/news/vesper-vm101-piezoelectric-mems-microphone,29187.html & http://www.edn.com/design/analog/4457396/3/SmartEverything-and-the-rise-of-the-microphone-array
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greghall
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