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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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Arduino Starter Kit example
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Project 2 - Spaceship Interface
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This sketch is written to accompany Project 2 in the
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Arduino Starter Kit
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Parts required:
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1 green LED
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2 red LEDs
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pushbutton
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10 kilohm resistor
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3 220 ohm resistors
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Created 13 September 2012
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by Scott Fitzgerald
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http://www.arduino.cc/starterKit
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This example code is part of the public domain
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*/
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// Create a global variable to hold the
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// state of the switch. This variable is persistent
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// throughout the program. Whenever you refer to
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// switchState, you’re talking about the number it holds
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int switchstate = 0;
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void setup() {
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// declare the LED pins as outputs
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pinMode(3, OUTPUT);
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pinMode(4, OUTPUT);
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pinMode(5, OUTPUT);
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// declare the switch pin as an input
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pinMode(2, INPUT);
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}
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void loop() {
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// read the value of the switch
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// digitalRead() checks to see if there is voltage
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// on the pin or not
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switchstate = digitalRead(2);
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// if the button is not pressed
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// turn on the green LED and off the red LEDs
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if (switchstate == LOW) {
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digitalWrite(3, HIGH); // turn the green LED on pin 3 on
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digitalWrite(4, LOW); // turn the red LED on pin 4 off
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digitalWrite(5, LOW); // turn the red LED on pin 5 off
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}
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// this else is part of the above if() statement.
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// if the switch is not LOW (the button is pressed)
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// turn off the green LED and blink alternatively the red LEDs
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else {
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digitalWrite(3, LOW); // turn the green LED on pin 3 off
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digitalWrite(4, LOW); // turn the red LED on pin 4 off
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digitalWrite(5, HIGH); // turn the red LED on pin 5 on
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// wait for a quarter second before changing the light
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delay(250);
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digitalWrite(4, HIGH); // turn the red LED on pin 4 on
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digitalWrite(5, LOW); // turn the red LED on pin 5 off
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// wait for a quarter second before changing the light
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delay(250);
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}
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}
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