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实验题目

GPIO亮灯

实验目的

点亮三个灯闪烁频率为一秒

硬件原理

无

关键代码及注释

const int ledPin1 =  GREEN_LED;      // the number of the LED pin

const int ledPin2 =  YELLOW_LED;

const int ledPin3 =  RED_LED;

// Variables will change:

int ledState = LOW;             // ledState used to set the LED

int ledState1 = LOW;

int ledState2 = LOW;

int ledState3 = LOW;

int count1=0;

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;           // interval at which to blink (milliseconds)

void setup() {

  // set the digital pin as output:

  pinMode(ledPin1, OUTPUT);

  pinMode(ledPin2, OUTPUT);

  pinMode(ledPin3, OUTPUT);      

}

void loop()

{

  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the

  // difference between the current time and last time you blinked

  // the LED is bigger than the interval at which you want to

  // blink the LED.

  unsigned long currentMillis = millis();

  if(count1<3 ||(count1>=8 &&count1<11)){

  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;

      count1+=1;

      }

    // set the LED with the ledState of the variable:

 digitalWrite(ledPin1, ledState);

 digitalWrite(ledPin2, ledState);

 digitalWrite(ledPin3, ledState);

 }

}

if(count1>=3 && count1<8){

  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;

      count1+=1;         //最后一个灯闪过之后，count+1

      }

      else if(ledState3 == HIGH){

      ledState3 = LOW;

      ledState1 = HIGH;

      }

 digitalWrite(ledPin1, ledState1);

 digitalWrite(ledPin2, ledState2);

 digitalWrite(ledPin3, ledState3);

  }

}

}

实验步骤

1. 三个灯一起闪3次
2. 跑马灯5遍
3. 三个灯一起闪3次
4. 熄灭

实验结果

思考与反馈

无