That way, if you have used different pins than I, you just need to modify those 2 lines. Setup #define LED_PIN 8įirst, as a best practice, we use some defines to keep the pin number for the LED and push button. And when we press the button the LED should be on. What we want to achieve is simple: when the button is not pressed, the LED is off. Turn on the LED when button is pressed, turn it off otherwise Finally, connect a leg of the button (same side as the pull down resistor) to a digital pin (here 7).Īll right your circuit is now finished.Add a red wire between another leg of the button and VCC (5V).This resistor will act as a “pull down” resistor, which means that the default button’s state will be LOW. Connect one leg of the button to the ground, and put a 10k Ohm resistor in between.Add the push button to the breadboard, like in the picture.Add a 220 Ohm resistor in between to limit the current going through the LED. Connect the longer leg of the LED to a digital pin (here pin no 8, you can change it).Plug this shorter leg to the ground (blue line here) of the circuit. You can notice that the LED has a leg shorter than the other. Plug a black wire between the blue line of the breadboard and a ground (GND) pin on the Arduino board.First, make sure to power off your Arduino – remove any USB cable.

Step by step instructions to build the circuit ( more info about Arduino pins here): A bunch of male to male wires (including if possible black, red, and other colors).If you don’t have, you can go until 20k-50k Ohm. If you don’t have this specific value, any resistor from 330 to 1k Ohm will do. Arduino board (any board, if you don’t have Uno you can easily adapt by finding corresponding pins).To build the circuit you will need those components: Conclusion – Arduino turn Led ON and OFF with button.Turn LED on and off with button – using debounce.Toggle the LED when the button has been released.Toggle LED’s state with the push button – first iteration.Loop – Turn on the LED when button is pressed.Turn on the LED when button is pressed, turn it off otherwise.Arduino circuit with an LED and a button.

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