Push-Button

There is nothing more frustrating than a push button that seems to work at random. The good news is the fix is pretty simple: a resistor. It may not seem obvious when you first start working with electronics but a “floating pin” doesn’t have a defined “high” or “low” level. Remember from the Analog and Digital video, that Digital Electronics has defined voltage levels. Well, when you don’t connect anything to the I/O pin of your microcontroller, the voltage level is undefined!