Digital_Inputs
Blech-example of a Button controlling an LED.
Building
As before (see e.g. https://github.com/mschlund/RGB_LED)
$ git clone https://github.com/mschlund/Digital_Inputs.git
$ cd Digital_Inputs
$ make
and then build and flash the Digital_Inputs.ino with your favorite Arduino-IDE.
Blogpost: https://maximilianschlund.wordpress.com/2020/11/05/lesson-3a-digital-input/