写一个循迹小车代码

好的，以下是一个简单的循迹小车代码，供参考：

//定义引脚
int leftSensorPin = 2;
int rightSensorPin = 3;
int leftMotorPin1 = 4;
int leftMotorPin2 = 5;
int rightMotorPin1 = 6;
int rightMotorPin2 = 7;

void setup() {
  //初始化引脚
  pinMode(leftSensorPin, INPUT);
  pinMode(rightSensorPin, INPUT);
  pinMode(leftMotorPin1, OUTPUT);
  pinMode(leftMotorPin2, OUTPUT);
  pinMode(rightMotorPin1, OUTPUT);
  pinMode(rightMotorPin2, OUTPUT);
}

void loop() {
  //读取左右传感器的状态
  int leftSensorState = digitalRead(leftSensorPin);
  int rightSensorState = digitalRead(rightSensorPin);

  //如果两个传感器都在黑色线上，则小车直行
  if (leftSensorState == LOW && rightSensorState == LOW) {
    digitalWrite(leftMotorPin1, HIGH);
    digitalWrite(leftMotorPin2, LOW);
    digitalWrite(rightMotorPin1, HIGH);
    digitalWrite(rightMotorPin2, LOW);
  }
  //如果左传感器在黑线上，则小车向左转
  else if (leftSensorState == HIGH && rightSensorState == LOW) {
    digitalWrite(leftMotorPin1, LOW);
    digitalWrite(leftMotorPin2, HIGH);
    digitalWrite(rightMotorPin1, HIGH);
    digitalWrite(rightMotorPin2, LOW);
  }
  //如果右传感器在黑线上，则小车向右转
  else if (leftSensorState == LOW && rightSensorState == HIGH) {
    digitalWrite(leftMotorPin1, HIGH);
    digitalWrite(leftMotorPin2, LOW);
    digitalWrite(rightMotorPin1, LOW);
    digitalWrite(rightMotorPin2, HIGH);
  }
  //如果两个传感器都不在黑线上，则小车停止
  else {
    digitalWrite(leftMotorPin1, LOW);
    digitalWrite(leftMotorPin2, LOW);
    digitalWrite(rightMotorPin1, LOW);
    digitalWrite(rightMotorPin2, LOW);
  }
}

以上代码使用两个红外线传感器来检测黑色线路，根据传感器的状态控制小车的电机转动以实现循迹功能。当两个传感器都在黑线上时，小车直行；如果左传感器在黑线上，则小车向左转；如果右传感器在黑线上，则小车向右转；如果两个传感器都不在黑线上，则小车停止。您可以根据自己的需求进行修改和优化。