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[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
int ledDelay(65);
int direction = 1;
int currentLED = 0;
unsigned long changeTime;

void setup() {
    for(int i=0; i<10; i++){
        pinMode(ledPin[i], OUTPUT);
    }

    changeTime = millis();
}

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

void changeLED() {
    for(int i=0; i<10; i++){
        digitalWrite(ledPin[i], LOW);
    }

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

    currentLED += direction;

    if(currentLED == 4){
        direction = -1;
    }

    if(currentLED == 0){
        direction = 1;
    }
}

添加结果视频

2. LED弹跳球

// adr302.ino

byte ledPin[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
int ledDelay(65);
int direction = 1;
int currentLED = 0;
int maxHeight = 9;
unsigned long changeTime;

void setup() {
    for(int i=0; i<10; i++){
        pinMode(ledPin[i], OUTPUT);
    }

    changeTime = millis();
}

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

void changeLED() {
    for(int i=0; i<10; i++){
        digitalWrite(ledPin[i], LOW);
    }

    digitalWrite(ledPin[currentLED], HIGH);

    currentLED += direction;

    if(currentLED == maxHeight){
        direction = -1;
        maxHeight -= 1;
    }

    if(currentLED == 0){
        direction = 1;
        maxHeight = 9;
    }
}