Arduino UNO — Quick Intro A Workshop in BSB with the Kids :) https://medium.com/kidstronics/arduino-uno-quick-intro-94c7c682740a

_10_PushButton_02.ino

/*
  Kids-Serie#10
  Project : Arduino Start Up
  Ino File: _10_PushButton_02.ino  
 */

void setup() {                    // put your setup code here, to run once:
  
  pinMode(3, OUTPUT);             // LED connected

  pinMode(7, INPUT);              // Push Button connected

}

void loop() {                     // put your main code here, to run repeatedly:
  
  if (digitalRead(7) == HIGH) {   // is button pressed?

    digitalWrite(3, HIGH);        // yes, then light LED

  } else {

    digitalWrite(3, LOW);         // no, turn off the led ;)

  }

}