Buttons

Overview Any device used to break or complete a circuit The design engineer decides which device should be used for each specific circumstance A switch is a type of “latching” button

Arduino The goal of the button is to alter the voltage entering the digital pins A microcontroller sees CHANGES in voltage If the pin normally has 0V, then pressing a button should connect it to 5v

Arduino Button Pins opposite each other are always connected Pressing the button connects to 2 pins on the left to the 2 pins on the right

Circuit

Circuits – Normally LOW D2 is normally connected to ground through the unpressed button

Circuits – Normally LOW When the button is pressed, the 5V side of the button connects to D2 The resistor prevents a short circuit between 5V and ground when the button is pressed

Coding

Coding Or more simply

Complete the Button lab in the book