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int Echo = A1; // Echo回聲腳(P2.0)
int Trig =A0; // Trig 觸發腳(P2.1)
int Distance = 0;
int Left_motor_go=8; //左電機前進(IN1)
int Left_motor_back=9; //左電機后退(IN2)
int Right_motor_go=10; // 右電機前進(IN3)
int Right_motor_back=11; // 右電機后退(IN4)
int key=A2;//定義按鍵 A2 接口
int beep=A3;//定義蜂鳴器 A3 接口
void setup()
{
pinMode(Left_motor_go,OUTPUT); // PIN 8 (PWM)
pinMode(Left_motor_back,OUTPUT); // PIN 9 (PWM)
pinMode(Right_motor_go,OUTPUT);// PIN 10 (PWM)
pinMode(Right_motor_back,OUTPUT);// PIN 11 (PWM)
pinMode(key,INPUT);//定義按鍵接口為輸入接口
pinMode(beep,OUTPUT);
pinMode(Echo, INPUT); // 定義超聲波輸入腳
pinMode(Trig, OUTPUT); // 定義超聲波輸出腳
}
//=======================智能小車的基本動作=========================
//void run(int time) // 前進
void run() // 前進
{
digitalWrite(Right_motor_go,HIGH); // 右電機前進
digitalWrite(Right_motor_back,LOW);
analogWrite(Right_motor_go,150);//0~255調速，左右輪差異略增減
analogWrite(Right_motor_back,0);
digitalWrite(Left_motor_go,LOW); // 左電機前進
digitalWrite(Left_motor_back,HIGH);
analogWrite(Left_motor_go,0);//PWM比例0~255調速，左右輪差異略增減
analogWrite(Left_motor_back,150);
//delay(time * 100); //執行時間，可以調整
}
void brake(int time) //剎車，停車
{
digitalWrite(Right_motor_go,LOW);
digitalWrite(Right_motor_back,LOW);
digitalWrite(Left_motor_go,LOW);
digitalWrite(Left_motor_back,LOW);
delay(time * 100);//執行時間，可以調整
}
//void left(int time) //左轉(左輪不動，右輪前進)
void left() //左轉(左輪不動，右輪前進)
{
digitalWrite(Right_motor_go,HIGH); // 右電機前進
digitalWrite(Right_motor_back,LOW);
analogWrite(Right_motor_go,150);
analogWrite(Right_motor_back,0);//PWM比例0~255調速
digitalWrite(Left_motor_go,LOW); //左輪后退
digitalWrite(Left_motor_back,LOW);
analogWrite(Left_motor_go,0);
analogWrite(Left_motor_back,0);//PWM比例0~255調速
//delay(time * 100); //執行時間，可以調整
}
void spin_left(int time) //左轉(左輪后退，右輪前進)
{
digitalWrite(Right_motor_go,HIGH); // 右電機前進
digitalWrite(Right_motor_back,LOW);
analogWrite(Right_motor_go,150);
analogWrite(Right_motor_back,0);//PWM比例0~255調速
digitalWrite(Left_motor_go,HIGH); //左輪后退
digitalWrite(Left_motor_back,LOW);
analogWrite(Left_motor_go,150);
analogWrite(Left_motor_back,0);//PWM比例0~255調速
delay(time * 100); //執行時間，可以調整
}
void right(int time)
//void right() //右轉(右輪不動，左輪前進)
{
digitalWrite(Right_motor_go,LOW); //右電機后退
digitalWrite(Right_motor_back,LOW);
analogWrite(Right_motor_go,0);
analogWrite(Right_motor_back,0);//PWM比例0~255調速
digitalWrite(Left_motor_go,LOW);//左電機前進
digitalWrite(Left_motor_back,HIGH);
analogWrite(Left_motor_go,0);
analogWrite(Left_motor_back,150);//PWM比例0~255調速
delay(time * 100); //執行時間，可以調整
}
void spin_right(int time) //右轉(右輪后退，左輪前進)
{
digitalWrite(Right_motor_go,LOW); //右電機后退
digitalWrite(Right_motor_back,HIGH);
analogWrite(Right_motor_go,0);
analogWrite(Right_motor_back,150);//PWM比例0~255調速
digitalWrite(Left_motor_go,LOW);//左電機前進
digitalWrite(Left_motor_back,HIGH);
analogWrite(Left_motor_go,0);
analogWrite(Left_motor_back,150);//PWM比例0~255調速
delay(time * 100); //執行時間，可以調整
}
void back(int time) //后退
{
digitalWrite(Right_motor_go,LOW); //右輪后退
digitalWrite(Right_motor_back,HIGH);
analogWrite(Right_motor_go,0);
analogWrite(Right_motor_back,150);//PWM比例0~255調速
digitalWrite(Left_motor_go,HIGH); //左輪后退
digitalWrite(Left_motor_back,LOW);
analogWrite(Left_motor_go,150);
analogWrite(Left_motor_back,0);//PWM比例0~255調速
delay(time * 100); //執行時間，可以調整
}
//==========================================================
void keysacn()//按鍵掃描
{
int val;
val=digitalRead(key);//讀取數字7 口電平值賦給val
while(!digitalRead(key))//當按鍵沒被按下時，一直循環
{
val=digitalRead(key);//此句可省略，可讓循環跑空
}
while(digitalRead(key))//當按鍵被按下時
{
delay(10); //延時10ms
val=digitalRead(key);//讀取數字7 口電平值賦給val
if(val==HIGH) //第二次判斷按鍵是否被按下
{
digitalWrite(beep,HIGH); //蜂鳴器響
while(!digitalRead(key)) //判斷按鍵是否被松開
digitalWrite(beep,LOW); //蜂鳴器停止
}
else
digitalWrite(beep,LOW); //蜂鳴器停止
}
}
void Distance_test() // 量出前方距離
{
digitalWrite(Trig, LOW); // 給觸發腳低電平2μs
delayMicroseconds(2);
digitalWrite(Trig, HIGH); // 給觸發腳高電平10μs，這里至少是10μs
delayMicroseconds(10);
digitalWrite(Trig, LOW); // 持續給觸發腳低電
float Fdistance = pulseIn(Echo, HIGH); // 讀取高電平時間(單位：微秒)
Fdistance= Fdistance/58; //為什么除以58等于厘米， Y米=（X秒*344）/2
// X秒=（ 2*Y米）/344 ==》X秒=0.0058*Y米 ==》厘米=微秒/58
Distance = Fdistance;
}
void loop()
{
keysacn(); //調用按鍵掃描函數
while(1)
{
Distance_test();//測量前方距離
if(Distance < 30)//數值為碰到障礙物的距離，可以按實際情況設置
while(Distance < 30)//再次判斷是否有障礙物，若有則轉動方向后，繼續判斷
{
back(2);
spin_right(1);//右轉
digitalWrite(beep,HIGH); //蜂鳴器響
Distance_test();//測量前方距離
}
else
{
run();//無障礙物，直行
digitalWrite(beep,LOW);
}
}
}

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