It is used in many circuits to trigger the systems.

A Push Button is a type of switch which shorts or completes the circuit when it is pressed. Here, we are controlling a LED using Push Button. And this base will also be useful for the rest of the tutorial.įor more details on the LED part, check out: how to handle multiple LEDs with arrays and functions.In this tutorial, we are going to show you that how a push button works and how to use a push button in your circuit. This will quickly become a giant mess.īy using arrays and functions, we will be able to make the code clean and scalable, without too much effort. Now imagine if we have to do the same program for 17 LEDs. Here we just have 3 LEDs, and you can already see a lot of duplicate code. Improve the code with arrays and functions Else (button is not pressed), we power off all LEDs. In this case, we power on all 3 LEDs with digitalWrite(). If LOW, it means the button has been pressed (in our configuration with INPUT_PULLUP).

In the void loop(), we first read the push button’s state with digitalRead(), which we put inside a byte variable. Power on/off LEDs depending on button’s state void loop() In this configuration, when we read the button’s state, HIGH will mean “released”, and LOW will mean “pressed”. This allows us not to put an additional external resistor. In the void setup(), we set the mode for all the pins we’re going to use: Also this makes things easier if you want to physically change an LED to a different pin. Setup pins #define LED_1_PIN 11įirst we create some defines so we can easily use the pin numbers later in the code. #define LED_1_PIN 11īyte buttonState = digitalRead(BUTTON_PIN) When you press the button, all LEDs are turned on, and when you don’t press the button, all LEDs are turned off. Here is what we want to do: by default all LEDs are powered off. Let’s start with a very simple application, so we can get a good base for the code, which will help us for the following apps. All LEDs on when button is pressed, all LEDs off otherwise Here we don’t use any pull up or pull down resistor, as we’re going to use the internal Arduino pull up resistor.Ĭheck everything twice, and then you’re ready to write the code. Connect one side to GND, and the other side to a digital pin. For the push button: plug it in the middle of the breadboard like on the picture.Connect the shorter one to GND and the longer one to a digital pin, with a 220 Ohm resistor in between in order to reduce the current that goes through the LED. Arduino board (I use Arduino Uno but you can choose any other Arduino board).You are learning how to use Arduino to build your own projects?Ĭheck out Arduino For Beginners and learn step by step. Let’s first build the circuit we’re going to use throughout the tutorial.

Conclusion – Arduino push button with multiple LEDsĪrduino circuit with a push button and 3 LEDs.

Mechanism to toggle next LED when button has been released.

Toggle next LED when push button is released.

Detect when button is released (with debounce).

Toggle between all LEDs on/off when releasing the button.

Read the button’s state and power on/off all LEDs.

Improve the code with arrays and functions.

Power on/off LEDs depending on button’s state.

All LEDs on when button is pressed, all LEDs off otherwise.

Arduino circuit with a push button and 3 LEDs.

Led with push button arduino