#1 Arduino Mega: GPIO Testing using Switch and LED

IoT Tutorial #1 [ Arduino Mega Tutorials #1 ] 
Here I will demonstrate Basic, a very first project using Arduino Mega (ATMega 2560).

Problem Statement:
GPIO Testing of the Arduino Mega using Switch and LED.

Requirements:
- Arduino Mega (ATMega 2560)
- USB Cable (A to B)
- 1 LED
- 1k Resistor
- 1 Switch (Push Button)
- Bread Board
- Male to Male wires (minimum 2)





Program Outcome:

When you press the Switch -> LED will Turn ON
Otherwise  -> LED will remain OFF

Physical Connection:

Pin 2 -> Switch (pullup)(pressed means short to Gnd)(pressed->0, unpressed->1)
Pin 7 -> LED+  
Gnd   -> LED-

Downloads:

Download link is given in the Description of the YouTube video shown below.

Demonstration:
  

Program:

const int pin_led_out = 7;
const int pin_sw_in = 2;

void setup() {
  // put your setup code here, to run once:
  pinMode(pin_led_out, OUTPUT);     //Set led_pin as Output
  pinMode(pin_sw_in, INPUT_PULLUP); // set switch_pin as Input //Pullup means default state = HIGH
}

void loop() {
  // put your main code here, to run repeatedly:
  int sw_state = digitalRead(pin_sw_in);
  if (sw_state == LOW)                    //If Switch is pressed
  {
    digitalWrite(pin_led_out, HIGH);      //LED ON  //5V
  }
  else                                    
  {
    digitalWrite(pin_led_out, LOW);       //LED OFF  //0V
  }
}

Click here to see more codes for Arduino Mega (ATMega 2560) and similar Family.

Feel free to ask doubts in the comment section. I will try my best to solve it.

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This is the simplest way to encourage me to keep doing such work.

Thanks and Regards,

-Akshay P. Daga