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Button Reading

In this example we will read a button and activate an LED when it is pressed.

Materials​

  • Franzininho board
  • Breadboard
  • 3mm LED
  • 1 330 Ohm resistor
  • 1 1k resistor
  • 1 Button
  • Male/female jumper wires

Circuit​

On the breadboard insert the LED, resistors, and button as shown in the image below:

Button Reading Circuit

Sketch​

/*
  Franzininho
  Example: Button Reading - Pull Down
  This example shows how to read a button with a pull-down resistor
  and activate an LED when it is pressed
*/
const int LED = 1;    // pin for the LED
const int BUTTON = 2; // pin for the button
int val = 0; // val will be used to store the pin state

void setup(){
  pinMode(LED, OUTPUT);    // the LED is an output
  pinMode(BUTTON, INPUT);  // the BUTTON is an input
}

void loop(){
  val = digitalRead(BUTTON); // read and store the input value
  digitalWrite(LED, val);    // drive LED according to button value
}

Simulation​

Working Video​