hdu物联网硬件实验3 按键和中断

学院		班级		学号
姓名		日期		成绩
实验题目	按键和中断
实验目的	实现闪灯功能转换
硬件原理	无
关键代码及注释	/*   Button  Turns on and off a light emitting diode(LED) connected to digital    pin 13, when pressing a pushbutton attached to pin 2.  The circuit:  * LED attached from pin 13 to ground  * pushbutton attached to pin 2 from +3.3V  * 10K resistor attached to pin 2 from ground  * Note: on most Arduinos there is already an LED on the board  attached to pin 13.  created 2005  by DojoDave <http://www.0j0.org>  modified 30 Aug 2011  by Tom Igoe  modified Apr 27 2012  by Robert Wessels  This example code is in the public domain.  http://www.arduino.cc/en/Tutorial/Button  */ // constants won't change. They're used here to // set pin numbers: const int buttonPin = PUSH2;     // the number of the pushbutton pin const int ledPin1 =  GREEN_LED;      // the number of the LED pin const int ledPin2 =  YELLOW_LED; const int ledPin3 =  RED_LED; int ledState = LOW; int ledState1 = LOW; int ledState2 = LOW; int ledState3 = LOW; volatile bool state = HIGH; int count = 0; // variables will change: int buttonState = 0;         // variable for reading the pushbutton status long previousMillis = 0;        // will store last time LED was updated long term = 0; // the follow variables is a long because the time, measured in miliseconds, // will quickly become a bigger number than can be stored in an int. long interval = 1000;   void setup() {   // initialize the LED pin as an output:   pinMode(ledPin1, OUTPUT);         pinMode(ledPin2, OUTPUT);   pinMode(ledPin3, OUTPUT);   //digitalWrite(ledPin,state);   pinMode(buttonPin,INPUT_PULLUP);   attachInterrupt (buttonPin ,blink ,RISING); } void blink(){   state = !state; } void loop(){   unsigned long currentMillis = millis();      if(state==HIGH){   if(currentMillis - previousMillis > interval) {     // save the last time you blinked the LED     previousMillis = currentMillis;        // if the LED is off turn it on and vice-versa:     if (ledState == LOW)       ledState = HIGH;     else{       ledState = LOW;              }     // set the LED with the ledState of the variable:  digitalWrite(ledPin1, ledState);  digitalWrite(ledPin2, ledState);  digitalWrite(ledPin3, ledState);  } } else{   if(currentMillis - previousMillis > interval) {     previousMillis = currentMillis;       if (ledState1 == LOW && ledState2 == LOW && ledState3 == LOW)       ledState1 = HIGH;     else if(ledState1 == HIGH){       ledState1 = LOW;       ledState2 = HIGH;       }      else if(ledState2 == HIGH){       ledState2 = LOW;       ledState3 = HIGH;                     }       else if(ledState3 == HIGH){       ledState3 = LOW;       ledState1 = HIGH;             }  digitalWrite(ledPin1, ledState1);  digitalWrite(ledPin2, ledState2);  digitalWrite(ledPin3, ledState3);   } } }
实验步骤	在上次作业基础上加上了按钮，中断
实验结果
思考与反馈	无