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實驗題目

按鍵和中斷

實驗目的

實現閃燈功能轉換

硬件原理

無

關鍵代碼及注釋

/*

??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);

??}

}

}

實驗步驟

在上次作業基礎上加上了按鈕，中斷

實驗結果

思考與反饋

無