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/*
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 September 2012
by Scott Fitzgerald
http://arduino.cc/starterKit
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;
}
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