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Author Name: BoingBoing
This story was originally published on Boingboing.net. [1]
License: CC-BY-NC-SA 3.0.[2]


A bat detector made with a Raspberry Pi

2021-10-05 00:00:00

If you've run out of bat detectors but the bat detector store has already closed for the day, fret not! Here is kryptonaut's report about constructing a bat detector with a Raspberry Pi and other inexpensive components. The code isn't made available, but if you have some experience coding bare-metal on the Pi it shouldn't drive you too batty figuring it out. Click through for a recording made with the device.

It's basically a kind of granulator which slows down incoming audio by up to 4 octaves, but works in approximately real-time by overlapping the slowed down sounds as necessary. I originally designed it for listening to slowed down birdsong, but the mics I used are responsive up to 100KHz so it's turned out to be a rather effective bat detector – it's very cool to hear them chirping as they fly overhead at dusk.
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[1] URL: https://boingboing.net/2021/10/05/a-bat-detector-made-with-a-raspberry-pi.html
[2] URL: https://creativecommons.org/licenses/by-nc-sa/3.0/us/

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