A tactile switch, also called a momentary button or push-to-make ... two pairs of leads (1&2, 3&4) that connect internally to the same switch — although there are four legs you only get a ...

You will need the Arduino Board, a 560Ω resistor, and LED and the code example below. We set the pinButton variable as integer 8 and we connect the button at pin 8 on the Board. Then the LED is ...

[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.