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。

 1 // adr301.ino

 2 

 3 byte ledPin[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};

 4 int ledDelay(65);

 5 int direction = 1;

 6 int currentLED = 0;

 7 unsigned long changeTime;

 8 

 9 void setup() {

10     for(int i=0; i<10; i++){

11         pinMode(ledPin[i], OUTPUT);

12     }

13 

14     changeTime = millis();

15 }

16 

17 void loop() {

18     if((millis() - changeTime) > ledDelay){

19         changeLED();

20         changeTime = millis();

21     }

22 }

23 

24 void changeLED() {

25     for(int i=0; i<10; i++){

26         digitalWrite(ledPin[i], LOW);

27     }

28 

29     digitalWrite(ledPin[currentLED], HIGH);

30     digitalWrite(ledPin[10 - 1 - currentLED], HIGH);

31 

32     currentLED += direction;

33 

34     if(currentLED == 4){

35         direction = -1;

36     }

37 

38     if(currentLED == 0){

39         direction = 1;

40     }

41 }

添加结果视频

2. LED弹跳球

 1 // adr302.ino

 2 

 3 byte ledPin[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};

 4 int ledDelay(65);

 5 int direction = 1;

 6 int currentLED = 0;

 7 int maxHeight = 9;

 8 unsigned long changeTime;

 9 

10 void setup() {

11     for(int i=0; i<10; i++){

12         pinMode(ledPin[i], OUTPUT);

13     }

14 

15     changeTime = millis();

16 }

17 

18 void loop() {

19     if((millis() - changeTime) > ledDelay){

20         changeLED();

21         changeTime = millis();

22     }

23 }

24 

25 void changeLED() {

26     for(int i=0; i<10; i++){

27         digitalWrite(ledPin[i], LOW);

28     }

29 

30     digitalWrite(ledPin[currentLED], HIGH);

31 

32     currentLED += direction;

33 

34     if(currentLED == maxHeight){

35         direction = -1;

36         maxHeight -= 1;

37     }

38 

39     if(currentLED == 0){

40         direction = 1;

41         maxHeight = 9;

42     }

43 }