Project 08 - Digital Hourglass 数字沙漏

/*
  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);