Arduino-Development / examples /10.StarterKit_BasicKit /p08_DigitalHourglass /p08_DigitalHourglass.ino
| /* | |
| Arduino Starter Kit example | |
| Project 8 - Digital Hourglass | |
| This sketch is written to accompany Project 8 in the Arduino Starter Kit | |
| Parts required: | |
| - 10 kilohm resistor | |
| - six 220 ohm resistors | |
| - six LEDs | |
| - tilt switch | |
| created 13 Sep 2012 | |
| by Scott Fitzgerald | |
| https://store.arduino.cc/genuino-starter-kit | |
| This example code is part of the public domain. | |
| */ | |
| // named constant for the switch pin | |
| const int switchPin = 8; | |
| unsigned long previousTime = 0; // store the last time an LED was updated | |
| int switchState = 0; // the current switch state | |
| int prevSwitchState = 0; // the previous switch state | |
| int led = 2; // a variable to refer to the LEDs | |
| // 600000 = 10 minutes in milliseconds | |
| long interval = 600000; // interval at which to light the next LED | |
| void setup() { | |
| // set the LED pins as outputs | |
| for (int x = 2; x < 8; x++) { | |
| pinMode(x, OUTPUT); | |
| } | |
| // set the tilt switch pin as input | |
| pinMode(switchPin, INPUT); | |
| } | |
| void loop() { | |
| // store the time since the Arduino started running in a variable | |
| unsigned long currentTime = millis(); | |
| // compare the current time to the previous time an LED turned on | |
| // if it is greater than your interval, run the if statement | |
| if (currentTime - previousTime > interval) { | |
| // save the current time as the last time you changed an LED | |
| previousTime = currentTime; | |
| // Turn the LED on | |
| digitalWrite(led, HIGH); | |
| // increment the led variable | |
| // in 10 minutes the next LED will light up | |
| led++; | |
| if (led == 7) { | |
| // the hour is up | |
| } | |
| } | |
| // read the switch value | |
| switchState = digitalRead(switchPin); | |
| // if the switch has changed | |
| if (switchState != prevSwitchState) { | |
| // turn all the LEDs low | |
| for (int x = 2; x < 8; x++) { | |
| digitalWrite(x, LOW); | |
| } | |
| // reset the LED variable to the first one | |
| led = 2; | |
| //reset the timer | |
| previousTime = currentTime; | |
| } | |
| // set the previous switch state to the current state | |
| prevSwitchState = switchState; | |
| } | |