Arduino从基础到实践第三章练习题

先写在这里，还没经过测试。

1. LED两端往中间移动，到中间后向两边返回。

 // adr301.ino

 byte ledPin[] = {, , , , , , , , , };
 int ledDelay();
 int direction = ;
 int currentLED = ;
 unsigned long changeTime;

 void setup() {
     for(int i=; i<; i++){
         pinMode(ledPin[i], OUTPUT);
     }

     changeTime = millis();
 }

 void loop() {
     if((millis() - changeTime) > ledDelay){
         changeLED();
         changeTime = millis();
     }
 }

 void changeLED() {
     for(int i=; i<; i++){
         digitalWrite(ledPin[i], LOW);
     }

     digitalWrite(ledPin[currentLED], HIGH);
     digitalWrite(ledPin[ -  - currentLED], HIGH);

     currentLED += direction;

     if(currentLED == ){
         direction = -;
     }

     if(currentLED == ){
         direction = ;
     }
 }

添加结果视频

2. LED弹跳球

 // adr302.ino

 byte ledPin[] = {, , , , , , , , , };
 int ledDelay();
 int direction = ;
 int currentLED = ;
 int maxHeight = ;
 unsigned long changeTime;

 void setup() {
     for(int i=; i<; i++){
         pinMode(ledPin[i], OUTPUT);
     }

     changeTime = millis();
 }

 void loop() {
     if((millis() - changeTime) > ledDelay){
         changeLED();
         changeTime = millis();
     }
 }

 void changeLED() {
     for(int i=; i<; i++){
         digitalWrite(ledPin[i], LOW);
     }

     digitalWrite(ledPin[currentLED], HIGH);

     currentLED += direction;

     if(currentLED == maxHeight){
         direction = -;
         maxHeight -= ;
     }

     if(currentLED == ){
         direction = ;
         maxHeight = ;
     }
 }