前进和后退，左右两边的方向都朝前或朝后，速度一致；
原地顺时针旋转时，左边轮子前进，右边轮子后退，速度一致； 原地逆时针旋转时，左边轮子后退，右边轮子前进，速度一致；
偏左前进时，左右两边的方向都朝前，左轮速度比右轮速度慢一点；
偏右前进时，左右两边的方向都朝前，左轮速度比右轮速度快一点；
偏左后退时，左右两边的方向都朝后，左轮速度比右轮速度慢一点； 偏右后退时，左右两边的方向都朝后，左轮速度比右轮速度快一点；
（左边俩个轮子用一个电机，右边俩个轮子用一个电机）
//左边的电机控制引脚#define leftMotor_1 6;#define leftMotor 7;#define leftMotor_2 8;//右边的电机控制引脚#define rightMotor_1 3;#define rightMotor 4;#define rightMotor_2 5;void setup() {// put your setup code here, to run once://设置控制电机的引脚为输出状态pinMode(leftMotor_1, OUTPUT);pinMode(leftMotor_2, OUTPUT);pinMode(rightMotor_1, OUTPUT);pinMode(rightMotor_2, OUTPUT);}void loop() {// put your main code here, to run repeatedly://控制小车左转,左边电机停止,右边电机正转void moveLeft(void){analogWrite(leftMotor_1, LOW);analogWrite(leftMotor, 0);analogWrite(leftMotor_2, LOW);analogWrite(rightMotor_1, LOW);analogWrite(rightMotor, 80);analogWrite(rightMotor_2, HIGH);}//控制小车右转,左边电机正转,右边电机停止void moveRight(void){analogWrite(leftMotor_1,LOW);analogWrite(leftMotor, 80);analogWrite(leftMotor_2, HIGH);analogWrite(rightMotor_1, LOW);analogWrite(rightMotor, 0);analogWrite(rightMotor_2, LOW);}//控制小车前进,左边电机正转,右边电机正转void moveForward(void){analogWrite(leftMotor_1, LOW);analogWrite(leftMotor, 150);analogWrite(leftMotor_2, HIGH);analogWrite(rightMotor_1, LOW);analogWrite(rightMotor, 150);analogWrite(rightMotor_2, HIGH);}//控制小车反转,左边电机反转,右边电机反转void moveBackward(void){analogWrite(leftMotor_1, HIGH);analogWrite(leftMotor, 120);analogWrite(leftMotor_2, LOW);analogWrite(rightMotor_1, HIGH);analogWrite(rightMotor, 120);analogWrite(rightMotor_2, LOW);}//控制小车停止,左边电机停止,右边电机停止void stopCar(void){analogWrite(leftMotor_1, LOW);analogWrite(leftMotor, 0);analogWrite(leftMotor_2, LOW);analogWrite(rightMotor_1, LOW);analogWrite(rightMotor, 0);analogWrite(rightMotor_2, LOW);} }
