There are educational DIY projects, there are useful DIY projects, there are complex DIY projects, and then there are some projects that are just totally cool. This one clearly falls in the latest category. Behold, the Ultrasonic Bat Detector!

Using only three components – a PIC 12F683 microcontroller, a ultrasonic piezo receiver, and a small piezo speaker – you can build the mighty “picoBat”. This is the answer to all of your bat-detection needs.

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