I'm very interesting on the wireless controll vehicle. My plan is to use Arduino on the vehicle, and run VB programed on PC to wireless control the vehicle. I just want to start with the USB to serial APC220 based wireless transmitting & receiver. Can somebody answer me how to encode the wireless realtime control the vehicle & put a kind of sample codes here, and the VB control program. later on I'd like to put more servos and camera on this system. plx help me out. tkx.

continue interprete DC driver.
http://robotbase.taobao.com/search.htm?spm=11028vrd.3-1lRnb.6-2sLVzs&scid=123975700&scname=1rHB97Xnu%2FrH%2FbavsOU%3D&checkedRange=true&queryType=cat
There is another project using the ultrasonic sensor to detect thing 50cm and light up the light.  ultrasonic sensor is RB URF v1.1
http://item.taobao.com/item.htm?spm=11028vrd.3-1lRnb.2328234110&id=2723263199&

Code:

int inputPin=4;  // 定义超声波信号接收接口          define the ultrasonic receive port 
int outputPin=5; // 定义超声波信号发出接口          define the ultrasonic emitting port
int ledpin=13;
void setup()
{
  Serial.begin(9600);
  pinMode(ledpin,OUTPUT);
  pinMode(inputPin, INPUT);
  pinMode(outputPin, OUTPUT);
}
void loop()

{
  digitalWrite(outputPin, LOW); // 使发出发出超声波信号接口低电平2μs        disable ultrasonic emitting 
  delayMicroseconds(2);                                                      delay 2μs
  digitalWrite(outputPin, HIGH); // 使发出发出超声波信号接口高电平10μs，这里是至少10μs      enable ultrasonic emitting,
  delayMicroseconds(10);                                                                      delay 10μs
  digitalWrite(outputPin, LOW);    // 保持发出超声波信号接口低电平                           disable ultrasonic emitting 
  int distance = pulseIn(inputPin, HIGH);  // 读出脉冲时间                                    read pulse
  distance= distance/58;   // 将脉冲时间转化为距离（单位：厘米）                              convert pulse into distance
  Serial.println(distance);   //输出距离值                                                   serial output distance
  delay(50);   
  if (distance >=50)
  {//如果距离大于50厘米小灯亮起                                     if distance is greater than 50cm, light the LED
     digitalWrite(ledpin,HIGH);
  }//如果距离小于50厘米小灯熄灭                                       if distance is smaller than 50cm, go out the LED
  else
     digitalWrite(ledpin,LOW);
}

First I can understand your feeling so far as a student in the school. All I want to know is you don' t have the coach from the teacher.Anyway I'm still a beginner for the Arduino. I purchase board from Taobao.com in China. And I'd like to share you some of my material for you. All the following is not exactly what you really need maybe, but I positively think you can start it up and just put the ultrasonic sensor together in the Arduino.
The vehicle platform. You also can visit the link(I don't mean a adv.) hope you don't mind the chinese web page. you can build the whole picture in this project.
http://trade.taobao.com/trade/itemlist/listBoughtItems.htm?action=itemlist/QueryAction&event_submit_do_query=1&prePageNo=1&clickMore=0&pageNum=2
Attach the program code as following, please ignore the chinese comment. I manually comment in English, wish it's helpful to you.

Code:

void setup()
{
  pinMode(8,OUTPUT);//定义I1接口                                define I1 port
  pinMode(9,OUTPUT);//定义I2接口                                define I2 port
  pinMode(10,OUTPUT);//定义EA(PWM调速)接口                      define EA PWM
  pinMode(5,OUTPUT);//定义EB(PWM调速)接口                       define EB PWM
  pinMode(6,OUTPUT);//定义I4接口                                define I4                            
  pinMode(7,OUTPUT);//定义I3接口                                define I3
  pinMode(3,INPUT);//定义左侧避障                               define left aviod obstacle sensor
  pinMode(4,INPUT);//定义中间避障                               define middle aviod obstacle sensor
  pinMode(11,INPUT);//定义右侧避障                              define right aviod obstacle sensor

}
void qianjin(int a)//前进                                      go forward sub
{
     analogWrite(10,a);//输入模拟值进行设定速度                analog value to set the speed
     analogWrite(5,a);                                        
     digitalWrite(7,LOW);//使直流电机（右）顺时针转            enable Right DC Motor clockwise rotate
     digitalWrite(6,HIGH);
     digitalWrite(8,HIGH);//使直流电机（左）逆时针转           enable Left DC Motor counter-clockwise rotate
     digitalWrite(9,LOW);

}
void youzhuan(int b)//右转                                     Turn right
{
     analogWrite(10,b);//输入模拟值进行设定速度                analog value to set the speed        
     analogWrite(5,b);
     digitalWrite(7,HIGH);//使直流电机（右）逆时针转           enable Right DC Motor counter-clockwise rotate
     digitalWrite(6,LOW);
     digitalWrite(8,HIGH);//使直流电机（左）顺时针转           enable Left DC Motor clockwise rotate
     digitalWrite(9,LOW);

}
void zuozhuan(int c)//左转                                    Turn Left
{
     analogWrite(10,c);//输入模拟值进行设定速度              analog value to set the speed  
     analogWrite(5,c);
     digitalWrite(7,LOW);//使直流电机（右）顺时针转          enable Right DC Motor clockwise rotate
     digitalWrite(6,HIGH);
     digitalWrite(8,LOW);//使直流电机（左）顺时针转          enable Left DC Motor clockwise rotate
     digitalWrite(9,HIGH);

}
void tingzhi()//停止                                         Stop
{
     digitalWrite(7,HIGH);//使直流电机（右）停转            enable Right DC Motor stop
     digitalWrite(6,HIGH);
     digitalWrite(8,HIGH);//使直流电机（左）停转            enable Left DC Motor stop
     digitalWrite(9,HIGH);
}
void houtui(int d)//后退                                    Go backward
{
     analogWrite(10,d);//输入模拟值进行设定速度             analog value to set the speed      

     analogWrite(5,d);
     digitalWrite(7,HIGH);//使直流电机（右）逆时针转       enable Right DC Motor counter-clockwise rotate  
     digitalWrite(6,LOW);
     digitalWrite(8,LOW);//使直流电机（左）顺时针转        enable Left DC Motor clockwise rotate
     digitalWrite(9,HIGH);
}
void loop()
{
    int r,m,l;
    r=digitalRead(11);
    m=digitalRead(4);
    l=digitalRead(3);
    if(l==HIGH &&m==HIGH && r==HIGH)
    qianjin(200);
    if(l==LOW &&m==LOW  && r==LOW )
      {
        houtui(200);
        delay(300);
        youzhuan(200);
        delay(300);
      }
    if(l==LOW &&m==HIGH  && r==LOW )
      {
        houtui(200);
        delay(300);
        youzhuan(200);
        delay(300);
      }
    if(l==HIGH  &&m==LOW  && r==HIGH  )
      {
        houtui(200);
        delay(300);
        youzhuan(200);
        delay(300);
      }
    if(l==LOW &&m==LOW  && r==HIGH )
    youzhuan(200);
    if(l==LOW && m==HIGH && r==HIGH)
    youzhuan(200);
    if(l==HIGH &&m==LOW  && r==LOW )
    zuozhuan(200);
    if(l==HIGH &&m==HIGH  && r==LOW )
    zuozhuan(200);
}

it's really interesting. i'm so far working on the serial control a vehicle. I can not handle the encoding to control the vehicle.

hi Paulware, http://paulware.comeze.com/#Heng Long 1/16 Tank is really a good stuffs link. tkx sharing.