hi everyone
i want to make the knock box from hackaday
but i can not find the sketch or schematic for it
could someone help please
thanks
marko
Looks like: an Arduino, solenoid with return spring (diode across coil), piezo sensor, solid state relay driving solenoid, and of course a wooden box. Maybe 2X9v batteries for the solenoid and 4.5v for Arduino?
It looks like the link died, but browsing the rest of that guy's web site finds the original article, with a download link at the bottom: