Reading a Button Press

This project is reading a button press.

BeginnerFull instructions provided1 hour31,802

Things used in this project

Hardware components

Arduino UNO

Breadboard (generic)

RGB Diffused Common Cathode

Resistor 100 ohm

Jumper wires (generic)

SparkFun Pushbutton switch 12mm

Resistor 10k ohm

Software apps and online services

Arduino IDE

Story

Introduction

This time we will control the LED with the button. Press the button to change the LED color and then turn off at the end!

Preparations

You need these.

1x Arduino 101 or Genuino 101 broard

1x Breadboard

1x RGB LED

3x 100Ω Resister

8x Jumper wires

1x Push button

1x 10K Resistors

Let's try!

This is Push Button. I'll put this on the breadboard.

Care point : Resistance is essential when connecting the button press and the LED!

And the method of connection is shown in the following two photographs.

Reading a Button Press

const int buttonPin = 3;
const int redPin = 11;
const int greenPin = 10;
const int bluePin = 9;


int counter = 0;
void setup()
{
  pinMode(buttonPin, INPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}


void loop()
{
  int buttonState;
  buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) // light the LED
  {
    counter++;
    delay(150);
  }

  if (counter == 0)
  {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, LOW);
  }
  
  else if (counter == 1)
  {
    digitalWrite(redPin, HIGH);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, LOW);
  }

  else if (counter == 2)
  {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
    digitalWrite(bluePin, LOW);
  }

  else if (counter == 3)
  {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, HIGH);
  }

  else
  {
    counter = 0;
  }
}