Arduino Helmholtz Sound Sensor for Hex-A-Bot
thingiverse
This device is a control system capable of detecting a 493 HZ tone, allowing it to activate a motor or other device, such as the Hex-A-Bot dual drive walking robot. The Helmholtz resonator provides selectivity in sound detection for the Arduino type sound sensor. A MOSFET is used as the output driver, with options like the IRLZ24N for high side drive and the IRLZ44N for low side drive, both of which are common and inexpensive. The whistle's frequency matches the Helmholtz enclosure's design. To see this device in action or learn how to build one, check out a YouTube video at https://youtu.be/n24caaZwvwM.
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