Parts · Sensors

Push button

6 × 6 mm tactile switch, 4 legs

Pressed, it joins two legs; let go, it opens again.

2Use it

Pin or leg	What it is for
4 legs	two pairs: the two legs on the same side of the gap are always joined

Put it across the middle gap of the breadboard.
One leg to the pin, the leg across from it to GND, and the pin’s pull-up on (INPUT_PULLUP on the Arduino).
With the pull-up, pressed reads 0 (LOW) and not pressed reads 1 (HIGH).

The idea behind it, step by step: Push button

Legs	4: two pairs joined inside

12 mm button	bigger, with the same 4 legs
Button with a cap	a coloured cap on top, easier to press