Arduino Tutorial 02: Buttons & PWM – Master Digital I/O & LED Control

Welcome to the second Arduino Tutorial from our Arduino Tutorial Series. In this tutorial we will learn how the Digital Input and Output pins work and we will make few examples using Buttons and LEDs. Also we will learn what is PWM (Pulse Width Modulation) and make examples for controlling the LED brightness using PWM.

This is a Step by Step Video Tutorial which is easy to be followed. Also, below the video you can find what Parts do we need for this tutorial and the Source Codes of the Examples in the video.

Components needed for this tutorial

• Arduino Board …………………………… / AliExpress
• Breadboard and Jump Wires ………  / AliExpress
• LED ……………………………………………
• 220 Ohm Resistor ……………………..

Circuit schematic of the examples

Source code of the first example

int button = 12;
int led = 13;

int buttonState = 0;

void setup() {
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
buttonState = digitalRead(button);
if (buttonState == HIGH)) {
digitalWrite(led, HIGH);
}
else {
digitalWrite(led, LOW);
}
}Code language: Arduino (arduino)

Source Code of the second example

int led = 13;
int button = 12;

int buttonState =0;
int brightness = 0;
int brightup = 2;

void setup() {
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
analogWrite(led, brightness);

buttonState = digitalRead(button);

if ( buttonState == HIGH ) {
brightness = brightness + brightup;
}
if ( brightness == 255 ) {
brightness = 0;
}
delay(30);
}Code language: Arduino (arduino)