CIRC-07: Pushbuttons

Purpose: 
Turn on an LED by holding down a push button.


Equipment:
•1 x Arduino Uno
•1 x Breadboard
•7 x Wire
•2 x Pushbutton
•1 x LED
•1 x 560 Ohm Resistor
•2 x 10k Ohm Resistor

Reference:
http://www.oomlout.com/a/products/ardx/circ-07

Program Details: 
Pushbuttons are initialized the same way LEDs are.

Time to Complete: 
25 minutes

Results:
The first pushbutton lit up the LED when held down. However, the second pushbutton did not do anything.

Photos of Project: 

Tips:
Pushbuttons can be misplaced on the breadboard. If nothing is happening, try rotating your pushbuttons 90 degrees.

Further Work:
Code can be added to make the second pushbutton have a function.

Program Modifications:
The program is exactly the one from http://www.oomlout.com/a/products/ardx/circ-07

Program:

const int buttonPin = 2;     // sets the pin the button is connected to as a constant
const int ledPin =  13;      // sets the pin the LED is connected to as a constant
int buttonState = 0;         // int for reading state of button

void setup()

{
  pinMode(ledPin, OUTPUT); //initializes pin 13 as an output 
  pinMode(buttonPin, INPUT);   //initializes pin 2 as an input  
}

void loop()

 {

  //reads the state of the button and assigns it to buttonState
  buttonState = digitalRead(buttonPin);        

  if (buttonState == HIGH) {  //checks if the button is pushed then the LED will go on
     digitalWrite(ledPin, HIGH);
  }
  else {                     //if not the LED will go off
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}