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 }