Project 3: Arduino Bush Button - Control LED 

 Main Ideas:

Introduction to the new electronic parts (pushbuttons), explains the difference between digital input pins vs digital output pins of  Arduino Uno microcontroller board and how we can program them to receive input and react to that and produce the output. Main programming concept Control Statements (IF / ELSE & Switch Case).

Project Description

Turns on and off a light emitting diode (LED) connected to digital pin 13, when pressing a pushbutton (digital input 5 V) attached to pin 2 and if not pressed (digital input 0 V) LED will be off.

Circuit

• RED LED
• Pushbutton 
• 1* 1K Resistor
• 1* 10K Resistor
• Arduino UNO

  //use this variable to read the state of the pushbutton value

int buttonState = 0;

void setup()

{

  // connected to Pin 2 of the Arduino the pushbutton pin, setup the pin2 as input to receive the input button pushed

  pinMode(2, INPUT);

  // the red LED is connected to Pin 13 of the Arduino, set up all the LED as OUTPUT

  pinMode(13, OUTPUT);

}

void loop()

{

  // read the state of the pushbutton

  buttonState = digitalRead(2);

  // check if pushbutton is pressed. if it is, the

  // button state is HIGH

  if (buttonState == HIGH) {

    digitalWrite(13, HIGH);

  } else {

    digitalWrite(13, LOW);

  }

  delay(10); // Delay a little bit to improve simulation performance

}