Conductive touch buttons for fischertechnik

thingiverse

Buttons printed with [conductive filament](https://www.filafarm.de/products/proto-pasta?_pos=1&variant=12337568835) for fischertechnik to be used with capacitive touch hard- or software. Can be used with: * Dedicated touch pins of some specific microcontrollers, e.g. [ESP32 touch sensor pins](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/touch_pad.html) * I2C touch sensor IC/module, e.g. MPR121 module from [Adafruit](https://learn.adafruit.com/adafruit-mpr121-12-key-capacitive-touch-sensor-breakout-tutorial) or [noname China module](https://de.aliexpress.com/wholesale?SearchText=MPR121) * single contact touch sensor IC/module, e.g. TP223 (see my note on using [the red modules](https://duckduckgo.com/?q=TP223+red+touch+sensor+module) with external contacts [here](https://www.thingiverse.com/thing:5370845)) * Software polling, e.g. [CapacitiveSensor Library](https://www.arduino.cc/reference/en/libraries/capacitivesensor/) (additional resistor needed) or [ADCTouch Library](https://www.arduino.cc/reference/en/libraries/adctouch/) (no additional resistor needed, only for AVRs) See also [this design](https://www.thingiverse.com/thing:5370845) for the red TP223 modules. https://www.youtube.com/watch?v=iABhU9tCzkg