主要依靠这里Michael McRoberts 着的《Arduino从基础到实践》进行总结,在本博文中，3-26书中给出的项目给出代码，希望能帮助大家减少学习过程中一些琐碎代码的写作。以后会更新后续代码。

//项目3 -----交通信号灯 //5秒红灯，然后闪3秒灭；2秒黄灯，灭；3秒绿灯，闪3秒灭 void setup() { 
           // put your setup code here, to run once:   pinMode(8,OUTPUT);   pinMode(12,OUTPUT);   pinMode(13,OUTPUT); } void flash(int pin){ 
           digitalWrite(pin,LOW);   delay(500);    digitalWrite(pin,HIGH);   delay(500);     digitalWrite(pin,LOW);   delay(500);     digitalWrite(pin,HIGH);   delay(500);      digitalWrite(pin,HIGH);   delay(500);     digitalWrite(pin,LOW);   delay(500);     digitalWrite(pin,HIGH);   delay(500);
return ;
}
void loop() { 
        
  // put your main code here, to run repeatedly:
  digitalWrite(13,HIGH);
  delay(5000);//亮5秒
  flash(13);
  digitalWrite(13,LOW);
  
  digitalWrite(12,HIGH);
  delay(3000);
  digitalWrite(12,LOW);
  digitalWrite(8,HIGH);
  delay(3000);
  flash(8);
  digitalWrite(8,LOW);
  delay(10000); 
}

//project5 跑马灯

byte pin[10] = { 
        4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
byte count = 0;
int ledDelay = 100;//这个变量控制住了跑马灯的速度
int direction = 1;
unsigned long changeTime;
void setup() { 
        
  // put your setup code here, to run once:
  for (int i = 0; i < 10; i++)
    pinMode(pin[i], OUTPUT);
  changeTime = millis();

}

void loop() { 
        
  // put your main code here, to run repeatedly:
  if (millis() - changeTime > ledDelay) { 
        
    changeLed();
    changeTime = millis();
  }
}
void changeLed() { 
        
  for (int i = 0; i < 10; i++) { 
        
    digitalWrite(pin[i], LOW);
  }
  digitalWrite(pin[count], HIGH);
  count += direction;
  if (count == 9) { 
        
    direction = -1;
  }
  if (count == 0) { 
        
    direction = 1;
  }

}

//project6 电位器控制跑马灯

byte pin[10] = { 
        4,5,6,7,8,9,10,11,12,13};
byte count = 0;
int ledDelay;//这个变量控制住了跑马灯的速度
int direction = 1;
unsigned long changeTime;
int potPin = 2;//电位计的输入引脚
void setup() { 
        
  // put your setup code here, to run once:
  for (int i=0;i<10;i++)
  pinMode(pin[i],OUTPUT);
  changeTime = millis();
  
}

void loop() { 
        
  ledDelay = analogRead(potPin);//从电位计中读值。
  // put your main code here, to run repeatedly:
  if (millis() - changeTime > ledDelay){ 
        
    changeLed();
    changeTime = millis();
  }
}
void changeLed(){ 
        
  for(int i = 0;i<10;i++){ 
        
    digitalWrite(pin[i],LOW);}
    digitalWrite(pin[count],HIGH);
    count += direction;
    if(count == 9){ 
        direction = -1;}
    if(count == 0){ 
        direction = 1;}
  
}

//project7 控制小灯的亮度。

int pin = 11;
float  sinVal;
int ledVal;

void setup() { 
        
  // put your setup code here, to run once:
  pinMode(pin, OUTPUT);
}

void loop() { 
        
  // put your main code here, to run repeatedly:
  for (int x = 0; x < 180; x++) { 
        
    sinVal = (sin(x * 3.1412 / 180)); //从0到1嘛
    ledVal = int(sinVal * 255); //从0 - 255 嘛
    analogWrite(pin, ledVal);
    delay(25);
  }
}

//project8 彩灯
float RGB1[3];
float RGB2[3];
float INC[3];

int red,green,blue;

int redpin =11;
int greenpin = 10;
int bluepin = 9;


void setup() { 
        
  // put your setup code here, to run once:
  randomSeed(analogRead(0));
  RGB1[0] = 0;
  RGB1[1] = 0;
  RGB1[2] = 0;
   RGB2[0] = random(256);
  RGB2[1] = random(256);
  RGB2[2] = random(256);
}

void loop() { 
        
  // put your main code here, to run repeatedly:
  randomSeed(analogRead(0));
  for (int i =0;i<3;i++){ 
        
    INC[i] = (RGB1[i] - RGB2[i])/256;}
    for (int i=0;i<256;i++){ 
        
      red = int(RGB1[0]);
      green = int(RGB1[1]);
      blue = int(RGB1[2]);
      analogWrite(redpin,red);
      analogWrite(greenpin,green);
      
      analogWrite(bluepin,blue);
      delay(100);
      RGB1[0] -= INC[0];
      RGB1[1] -= INC[1];
      RGB1[2] -= INC[2];     
  }
  for (int i=0;i<3;i++){ 
        
  RGB2[i] = random(556)-300;
  RGB2[i] = constrain(RGB2[i],0,255);
  delay(1000);
}
}

//project9 LED火焰效果

int pin1 = 9;
int pin2 = 10;
int pin3 = 11;
void setup() { 
        
  // put your setup code here, to run once:
  pinMode(pin1,OUTPUT);
  pinMode(pin2,OUTPUT);
  pinMode(pin3,OUTPUT);
}

void loop() { 
        
  // put your main code here, to run repeatedly:
analogWrite(pin1,random(120)+135);
analogWrite(pin2,random(120)+135);
analogWrite(pin3,random(120)+135);
delay(random(100));
}

//project10 串口控制灯
char b[18];
int r,g,b;
int rpin = 11;
int gpin = 10;
int bpin = 9;

void setup() { 
        
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.fulsh();
  pinMode(rpin,OUTPUT);
  pinMode(gpin,OUTPUT);
  pinMode(bpin,OUTPUT);
}

void loop() { 
        
  // put your main code here, to run repeatedly:
  if(Serial.available() > 0){ 
        
    int index = 0;
    delay(100);//等待缓冲区填满
    int num = Serial.available();
    if (num >15){ 
        
      num = 15;
    }
    while (num--){ 
        
      b[index++] = Serial.read();
    }
    splitString(butter);
  }
}
void splitString(char* data){ 
        
  Serial.print("Data enterd:");
  Serial.println(data);
  char* p;
  p = strtok (NULL,",");
  while ( p != NULL){ 
        
    setLED(p);
    p = strtok (NULL,",");
  }
  //清除窗口缓存区中的脚本
  for (int i = 0;i<16;i++){ 
        
    b[i] = '\0';
  }
  Serial.flush();
}
void setLED(char* data){ 
        
  if ((data[0] == 'r') || (data[0] =='R')){ 
        
    int Ans = strtol(data+1,NULL,10);
    Ans = (constrain(Ans,0,255);
    analogWrite(rpin,Ans);
    Serial.print("Red is set to :");
    Serial.println(Ans):
  }
  if((data[0] == 'g') || (data[0] =='G')){ 
        
    int Ans = strtol(data+1,NULL,10);
    Ans = constrain(Ans,0,255):
    analogWrite(gpin,Ans);
    Serial.print("Green is set to :");
    Serial.println(Ans):
  }
    if((data[0] == 'b') || (data[0] =='B')){ 
        
    int Ans = strtol(data+1,NULL,10);
    Ans = constrain(Ans,0,255):
    analogWrite(bpin,Ans);
    Serial.print("Blue is set to :");
    Serial.println(Ans):
  }
}

//project11 压电声音报警器

float sinVal;
int toneVal;
void setup() { 
        
  // put your setup code here, to run once:
  pinMode(8, OUTPUT);
}

void loop() { 
        
  // put your main code here, to run repeatedly:
  for (int i = 0; i < 180; i++) { 
        
    //当使用sin函数时转化角度到弧度
    sinVal = (sin(i * (3.1412 / 180))); //0-1的数字
    toneVal = 2000 + (int(sinVal * 1000));
    tone(8, toneVal);
    delay(2);//因为for循环时间很短，所以延时让再次改变声音之前持续至少2ms
  }
}