This tutorial will explain how to connect a switch to arduino board and read its state.

Components Required

  • Arduino Board
  • Switch
  • Wires
  • BreadBoard
  • 10 ohm Resistor

Connection Preview

Button

PROCEDURE

  • Connect a ground of an arduino to negative part rail of the breadboard.
  • Connect 5v pin to the positive part rail of the breadboard.
  • Connect Digital pin 2 to one of the legs of the switch.
  • On the same leg, connect 10 ohm resistor to ground.
  • Connect the other leg of the switch to 5v(positive part of breadboard).
  • Open Arduino Editor(If you have not done it).
  • On the setup function type:
Serial.begin(9600)
  • On the same function initialize digital pin 2, the pin that will read the output from your button, as an input:
pinMode(2,INPUT);
  • Initialize the variable to Read the value.
int sensorValue = digitalRead(2);
  • Print the value to the Serial
Serial.println(sensorValue);

Full Source Code

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int pushButton = 2;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  // make the pushbutton's pin an input:
  pinMode(pushButton, INPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input pin:
  int buttonState = digitalRead(pushButton);
  // print out the state of the button:
  Serial.println(buttonState);
  delay(1); // delay in between reads for stability
}