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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

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