这是之前课程设计做的遥控小车，简单的控制电机转速使小车前进和后退，左转右转也是参考了网上别人的，有需要的可以看看，哪里有不足也请指出

ATMEGA168单片机+L298仿真原理图如下

单片机源码：

int Foreward_key=2;//正转按钮
int Reverse_key=3;//反转按钮
int Stop_key=4;//停止按钮
int Trunleft_key=0;//左转按钮
int Trunright_key=1;//右转按钮
int Foreward_led=5;//正转指示灯
int Reverse_led=6;//反转指示灯
int Stop_led=7;//停止指示灯
int pinI1=8;//定义电机1正转接口
int pinI2=9;//定义电机1反转接口
int pinI3=13;//定义电机2正转接口
int pinI4=12;//定义电机2反转接口
int speedpin=14;//定义EA(PWM调速)接口
int speedpin1=14;//定义EB(PWM调速)接口
void setup()
{
  pinMode(Foreward_key,INPUT);
  pinMode(Reverse_key,INPUT);
  pinMode(Trunleft_key,INPUT);
  pinMode(Trunright_key,INPUT);
  pinMode(Stop_key,INPUT);
  pinMode(Foreward_led,OUTPUT);
  pinMode(Reverse_led,OUTPUT);
  pinMode(Stop_led,OUTPUT);
  pinMode(pinI1,OUTPUT);//定义该接口为输出接口
  pinMode(pinI2,OUTPUT);
  pinMode(pinI3,OUTPUT);//定义该接口为输出接口
  pinMode(pinI4,OUTPUT);
  pinMode(speedpin,OUTPUT);
  pinMode(speedpin1,OUTPUT);
  digitalWrite(Foreward_led,HIGH);
  digitalWrite(Reverse_led,HIGH);
  digitalWrite(Stop_led,HIGH);
}
void loop()
{ 
  if(digitalRead(Foreward_key)==HIGH)//正转
  {
    while(digitalRead(Foreward_key)==HIGH);
    digitalWrite(Foreward_led,LOW);
    digitalWrite(Reverse_led,HIGH);
    digitalWrite(Stop_led,HIGH);
    digitalWrite(pinI1,LOW);//使直流电机顺时针转
    digitalWrite(pinI2,HIGH);
    analogWrite(speedpin,100);
    digitalWrite(pinI3,LOW);//使直流电机顺时针转
    digitalWrite(pinI4,HIGH);
    analogWrite(speedpin1,100);
  }
  if(digitalRead(Reverse_key)==HIGH)//反转
  {
    while(digitalRead(Reverse_key)==HIGH);
    digitalWrite(Foreward_led,HIGH);
    digitalWrite(Reverse_led,LOW);
    digitalWrite(Stop_led,HIGH);
    digitalWrite(pinI1,HIGH);//使直流电机逆时针转
    digitalWrite(pinI2,LOW);
    analogWrite(speedpin,100);
    digitalWrite(pinI3,HIGH);//使直流电机逆时针转
    digitalWrite(pinI4,LOW);
    analogWrite(speedpin1,100);

  }
  if(digitalRead(Stop_key)==HIGH)//停止
  {
    while(digitalRead(Stop_key)==HIGH);
    digitalWrite(Foreward_led,HIGH);
    digitalWrite(Reverse_led,HIGH);
    digitalWrite(Stop_led,LOW);
    digitalWrite(pinI1,LOW);//使直流电机逆时针转
    digitalWrite(pinI2,LOW);
    analogWrite(speedpin,100);
    digitalWrite(pinI3,LOW);//使直流电机逆时针转
    digitalWrite(pinI4,LOW);
    analogWrite(speedpin1,100);
  }
  if(digitalRead(Trunleft_key)==HIGH)//左转
  {
    while(digitalRead(Trunleft_key)==HIGH);
    digitalWrite(Foreward_led,LOW);
    digitalWrite(Reverse_led,HIGH);
    digitalWrite(Stop_led,HIGH);
    digitalWrite(pinI1,LOW);//使直流电机顺时针转
    digitalWrite(pinI2,HIGH);
    analogWrite(speedpin,100);
    delay(120);
    digitalWrite(pinI3,LOW);//使直流电机顺时针转
    digitalWrite(pinI4,HIGH);
    analogWrite(speedpin1,100);

  }
    if(digitalRead(Trunright_key)==HIGH)//右转
  {
    while(digitalRead(Trunright_key)==HIGH);
    digitalWrite(Foreward_led,LOW);
    digitalWrite(Reverse_led,HIGH);
    digitalWrite(Stop_led,HIGH);
    digitalWrite(pinI3,LOW);//使直流电机顺时针转
    digitalWrite(pinI4,HIGH);
    analogWrite(speedpin1,100);
    delay(120);
    digitalWrite(pinI1,LOW);//使直流电机顺时针转
    digitalWrite(pinI2,HIGH);
    analogWrite(speedpin,100);
  }

}