Arduino RC Car

Posted on 17/03/2012 by nintwala
Modified on: 13/09/2018
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Introduction
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I had bought a RC Car from walmart for about $15 to use with the Arduino Motorshield a while back (see here). Fortunately, I had taken some pictures before I removed the RC receiver circuit from it. Turns out that its lot more efficient to use the onboard controller along with an Arduino instead of using a motorshield. I didnt some research and found out that many “cheap” RC cars use the same Realtek TX2 & RX2 chips inside. I was lucky enough to find the same inside this RC car. I was able ...


Arduino RC Car

I had bought a RC Car from walmart for about $15 to use with the Arduino Motorshield a while back (see here). Fortunately, I had taken some pictures before I removed the RC receiver circuit from it. Turns out that its lot more efficient to use the onboard controller along with an Arduino instead of using a motorshield. I didnt some research and found out that many “cheap” RC cars use the same Realtek TX2 & RX2 chips inside. I was lucky enough to find the same inside this RC car. I was able to connect 5 wires to the Arduino and control the car by sending a HIGH signal directly to the RX2 chip. Here are the in assignments.

Arduino 

RX2

Ground 

PIN2 (GND)

PIN 13 

PIN11 (Forward)

PIN 12 

PIN10 (Backward)

PIN 11

PIN6 (Right)

PIN 10 

 PIN7 (Left)

TX2 RX2 Pin Assignments

The 2 motors and the RX2 circuit is powered by 3xAA batteries in the car itself and the Arduino UNO was powered by a 9V battery. I also decided to add a PING sensor to make the car backup automatically when it comes close to something. The code is not perfect as you can see in the video, but it can be modified later.

TX2 RX2 document Link

RC Car Arduino Code Link

Video coming soon... Video added.


Image before I took the RC apart

Before1  Before2

Full Picture

Full1

 

Ping Sensor & RX2 Connection

 

RX2 Front & Back

RX2Front RX2Back

Drives and avoids obstacles

  • Actuators / output devices: 2 motors
  • Control method: Autonmous or RC
  • CPU: log rx2 stock, arduino uno
  • Operating system: Arduino IDE
  • Power source: 9v battery, 3x AA
  • Programming language: Arduino ide
  • Sensors / input devices: Parallax Ping)))
  • Target environment: indoor and outdoor
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