用arduino 写stmf103c8t6的一个磁力循迹小车

好的，下面是一个简单的磁力循迹小车的 Arduino 代码：

// 定义引脚
#define leftMotorF 10
#define leftMotorB 9
#define rightMotorF 6
#define rightMotorB 5
#define leftSensor A0
#define rightSensor A1
 
// 定义常量
const int threshold = 500;
const int speed = 100;
 
void setup() {
  // 设置引脚模式
  pinMode(leftMotorF, OUTPUT);
  pinMode(leftMotorB, OUTPUT);
  pinMode(rightMotorF, OUTPUT);
  pinMode(rightMotorB, OUTPUT);
  pinMode(leftSensor, INPUT);
  pinMode(rightSensor, INPUT);
}
 
void loop() {
  // 读取传感器数据
  int leftValue = analogRead(leftSensor);
  int rightValue = analogRead(rightSensor);
 
  // 判断是否在黑线上
  if (leftValue > threshold && rightValue > threshold) {
    // 直行
    digitalWrite(leftMotorF, HIGH);
    digitalWrite(leftMotorB, LOW);
    digitalWrite(rightMotorF, HIGH);
    digitalWrite(rightMotorB, LOW);
  } else if (leftValue > threshold && rightValue < threshold) {
    // 左转
    digitalWrite(leftMotorF, LOW);
    digitalWrite(leftMotorB, HIGH);
    digitalWrite(rightMotorF, HIGH);
    digitalWrite(rightMotorB, LOW);
  } else if (leftValue < threshold && rightValue > threshold) {
    // 右转
    digitalWrite(leftMotorF, HIGH);
    digitalWrite(leftMotorB, LOW);
    digitalWrite(rightMotorF, LOW);
    digitalWrite(rightMotorB, HIGH);
  } else {
    // 停止
    digitalWrite(leftMotorF, LOW);
    digitalWrite(leftMotorB, LOW);
    digitalWrite(rightMotorF, LOW);
    digitalWrite(rightMotorB, LOW);
  }
 
  // 控制小车速度
  analogWrite(leftMotorF, speed);
  analogWrite(rightMotorF, speed);
}

请注意，此代码中的引脚和常量可能需要根据你的电路进行修改。此外，由于每个磁力循迹小车的设计略有不同，因此你可能需要调整阈值（`threshold`）和速度（`speed`）等常量的值以获得最佳效果。