hdu物联网硬件实验3 按键和中断

学院

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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

 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