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
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);
}
}
