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Arduino/build/shared/examples/10.StarterKit/p02_SpaceshipInterface/p02_SpaceshipInterface.ino

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/*
Arduino Starter Kit example
Project 2 - Spaceship Interface
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This sketch is written to accompany Project 2 in the
Arduino Starter Kit
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Parts required:
1 green LED
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2 red LEDs
pushbutton
10 kilohm resistor
3 220 ohm resistors
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Created 13 September 2012
by Scott Fitzgerald
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http://arduino.cc/starterKit
This example code is part of the public domain
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*/
// Create a global variable to hold the
// state of the switch. This variable is persistent
// throughout the program. Whenever you refer to
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// switchState, youre 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);
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// declare the switch pin as an input
pinMode(2, INPUT);
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}
void loop() {
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// read the value of the switch
// digitalRead() checks to see if there is voltage
// on the pin or not
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switchstate = digitalRead(2);
// if the button is not pressed
// turn on the green LED and off the red LEDs
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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.
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// if the switch is not LOW (the button is pressed)
// turn off the green LED and blink alternatively the red LEDs
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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);
}
}