Touch wall switch for TTP223 touch sensor module

prusaprinters

This model is not difficult to print, but it is rather difficult to use.First, you need a TTP223 touch sensor (very cheap on Amazon) that will fit nicely in the center of the switch.Then you need to solder a 28awg wire to the sensor in order to extend the sentivity zone, the wire can be inserted in the small channel on the back of the switch. I strongly recommend to use 28 awg or smaller and use tape to keep it in place. If you use larger wires, the touch sensor will activate at a large distance from the switch (around 5cm) and sometimes activate on its own. The channel is designed to hold wire of maximum 1.70mm diameter.Then the hard part: you need to plug this switch to something. It needs 3 or 5v input, ground and signal output. In my home, I have 6 of these switches, all connected to the GPIO pins of a raspberry pi which hosts my home assistant instance. This means I had to pass 28awg ribbon cable through my whole appartment!I guess it is also possible to plug them to electrical relays.The switch is designed to fit in a standard 60mm circular wall mount. I designed an alternative version for square mounts.