space interface

 

Código:

/*

  Arduino Starter Kit example

 Project 2  - Spaceship Interface

 

 This sketch is written to accompany Project 2 in the

 Arduino Starter Kit

 

 Parts required:

 1 green LED 

 2 red LEDs

 pushbutton

 10 kilohm resistor

 3 220 ohm resistors

 

 Created 13 September 2012

 by Scott Fitzgerald

 

 http://arduino.cc/starterKit

 This example code is part of the public domain 

*/

// Create a global variable to hold the 

// state of the switch. This variable is persistent 

// throughout the program. Whenever you refer to 

// switchState, you’re talking about the number it holds

int switchstate = 0;

void setup(){

  // declare the LED pins as outputs 

  pinMode(3,OUTPUT);

  pinMode(4,OUTPUT);

  pinMode(5,OUTPUT);

  // declare the switch pin as an input   

  pinMode(2,INPUT);

}

void loop(){

  // read the value of the switch

  // digitalRead() checks to see if there is voltage

  // on the pin or not  

  switchstate = digitalRead(2);

  // if the button is not pressed

  // turn on the green LED and off the red LEDs  

  if (switchstate == LOW) {

    digitalWrite(3, HIGH); // turn the green LED on pin 3 on

    digitalWrite(4, LOW);  // turn the red LED on pin 4 off

    digitalWrite(5, LOW);  // turn the red LED on pin 5 off

  }

  // this else is part of the above if() statement. 

  // if the switch is not LOW (the button is pressed)

  // turn off the green LED and blink alternatively the red LEDs 

  else {

    digitalWrite(3, LOW);  // turn the green LED on pin 3 off

    digitalWrite(4, LOW);  // turn the red LED on pin 4 off

    digitalWrite(5, HIGH); // turn the red LED on pin 5 on

    // wait for a quarter second before changing the light

    delay(250);

    digitalWrite(4, HIGH); // turn the red LED on pin 4 on

    digitalWrite(5, LOW);  // turn the red LED on pin 5 off

    // wait for a quarter second before changing the light

    delay(250);

  }

}