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Knock to turn on your PC

If you have your PC somewhere deep in your stuff or you simply want to impress someone, this project might interest you. Simply speaking this is a PC on trigger circuit activated with a knock. Knock detector is based on piezoelectric sensor which is nothing more than piezo speaker from some gadget. Attiny45 reads piezo signal using ADC and program detects if there is a required pattern (three knocks).

If MCU detects three knocks it then generates 0x29 keyboard code and sends using PS/2 interface to computer. In other end. PC has to be configured to boot on PS/2 keyboard input. The only thing is left – hide sensor under table and start doing magic.

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