Each segment has a clicky feeling to it and each clockwise or counter-clockwise movement causes the two built-in switches to open and close ... hardware is up and running it’s time to tell your ...

and one with a breadboarded Arduino in 2015. While we’re at it though, it would be nice to see a few designed for European switches too.

Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that ... and the Push-ON (push ‘n’ hold) switch (S1) to activate the alarm function. An additional Electro-Magnetic ...