Spaceship Interface

1/*
2Spaceship Interface
3*/
4
5// 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.
6
7int  switchstate = 0;
8
9void setup() {
10// declare the LED pins as outputs
11pinMode(3,  OUTPUT);
12pinMode(4, OUTPUT);
13pinMode(5, OUTPUT);
14
15// declare the switch  pin as an input
16pinMode(2, INPUT);
17}
18
19void loop() {
20
21// read the  value of the switch. digitalRead() checks to see if there is voltage on the pin  or not
22switchstate = digitalRead(2);
23
24// if the button is not pressed turn  on the green LED and off the red LEDs
25if (switchstate == LOW) {
26digitalWrite(3,  HIGH); // turn the green LED on pin 3 on
27digitalWrite(4, LOW);  // turn the red  LED on pin 4 off
28digitalWrite(5, LOW);  // turn the red LED on pin 5 off
29}
30
31//  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
32else  {
33digitalWrite(3, LOW);  // turn the green LED on pin 3 off
34digitalWrite(4,  LOW);  // turn the red LED on pin 4 off
35digitalWrite(5, HIGH); // turn the red  LED on pin 5 on
36// wait for a quarter second before changing the light
37delay(250);
38digitalWrite(4,  HIGH); // turn the red LED on pin 4 on
39digitalWrite(5, LOW);  // turn the red  LED on pin 5 off
40// wait for a quarter second before changing the light
41delay(250);
42}
43}