mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-13 23:48:46 +01:00
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
|
||
Arduino Starter Kit example
|
||
Project 2 - Spaceship Interface
|
||
|
||
This sketch is written to accompany Project 2 in the Arduino Starter Kit
|
||
|
||
Parts required:
|
||
- one green LED
|
||
- two red LEDs
|
||
- pushbutton
|
||
- 10 kilohm resistor
|
||
- three 220 ohm resistors
|
||
|
||
created 13 Sep 2012
|
||
by Scott Fitzgerald
|
||
|
||
http://www.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);
|
||
}
|
||
}
|