In this video, the presenter will show you how to use an Arduino Uno development board into an ohmmeter/voltmeter. This is a very useful project that can tell you the resistance values of your ...

In this case, using a 220-ohm resistor with an Arduino UNO R3 (a 5V board) limits the current to a safe level for both the LED and the Arduino pin. Adjusting the resistor value allows you to control ...