arduino寻迹小车l289n代码

是一个基于L289N电机驱动芯片的Arduino寻迹小车代码示例：

//定义引脚
int left_motor_1 = 2;
int left_motor_2 = 3;
int right_motor_1 = 4;
int right_motor_2 = 5;
int left_sensor_1 = A0;
int left_sensor_2 = A1;
int right_sensor_1 = A2;
int right_sensor_2 = A3;

void setup() {
  //设置引脚模式
  pinMode(left_motor_1, OUTPUT);
  pinMode(left_motor_2, OUTPUT);
  pinMode(right_motor_1, OUTPUT);
  pinMode(right_motor_2, OUTPUT);
  pinMode(left_sensor_1, INPUT);
  pinMode(left_sensor_2, INPUT);
  pinMode(right_sensor_1, INPUT);
  pinMode(right_sensor_2, INPUT);
}

void loop() {
  //读取传感器数值
  int left_1 = analogRead(left_sensor_1);
  int left_2 = analogRead(left_sensor_2);
  int right_1 = analogRead(right_sensor_1);
  int right_2 = analogRead(right_sensor_2);

  //判断传感器数值，控制小车运动
  if (left_1 < 500 && left_2 < 500) {
    digitalWrite(left_motor_1, HIGH);
    digitalWrite(left_motor_2, LOW);
    digitalWrite(right_motor_1, LOW);
    digitalWrite(right_motor_2, HIGH);
  } else if (right_1 < 500 && right_2 < 500) {
    digitalWrite(left_motor_1, LOW);
    digitalWrite(left_motor_2, HIGH);
    digitalWrite(right_motor_1, HIGH);
    digitalWrite(right_motor_2, LOW);
  } else {
    digitalWrite(left_motor_1, HIGH);
    digitalWrite(left_motor_2, LOW);
    digitalWrite(right_motor_1, HIGH);
    digitalWrite(right_motor_2, LOW);
  }
}

该代码使用了4个红外传感器来实现小车的巡线功能，当左侧或右侧的传感器检测到黑色线条时，小车会向相反的方向转向，以保持在线条上行驶。当所有传感器都检测不到线条时，小车会直行。