In this design, only one push button switch is used to control the light output ... don’t forget to add a resistor (~1KΩ ) between Arduino D10 and the base terminal of the transistor.

[Ed] was tasked with adding push-button degaussing ... to use an SSR to switch the coil, and after making lots of transistor-based designs on paper, grabbed a nearby Arduino.

The electronics for this build include a printed circuit board that serves to break out the connections on an Arduino ... push buttons, four slide pots, two rotary pots, and a handful of screw ...

This is a simple 0 to 9 counter circuit constructed using Arduino! Here, a common cathode 7-segment LED display is connected to Arduino for displaying the digits. The code (Arduino sketch) allows push ...