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Posted by: Siddharth Chandrasekaran May 5, 2013 in How-To’s, Robotics 110 Comments
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Whether you are an engineering student building a multi terrain vehicle or an electronics hobbyist trying to impress people with your skills, Making a RC robot car (wireless)  is much better than the wired robot which you will have to tail while driving.
Here is a simple, yet informative post for beginners in the field of robotics. Mind you, this not robotics. This is just a toy with which you can play around and still get a hold of the basic concepts in building robots. To sum it up, there is one hell lot to do before going around telling people ‘I build robots’.
Objectives
We will discuss a basic ‘Land Rover’ with nothing. Well not exactly nothing, but nothing complex. As I mentioned earlier this is a really simple project, so simple that not even an embedded computer (microcontroller) is used.
The emphasis is just on the mechanical design and some basic circuitry. We learn the interface of the commercially available RF transmitter and receiver module coupled with HT12E/D pair (Encoder/Decoder) to transfer data over the air to the motor driver L293D.
Things you will need:
These are the things that you will need. Most of them are really common and can be bought in local stores. If you can’t find something, you can always get it form online vendors.
Just be extra cautious when buying the RF Rx-Tx module. They are really fragile and can be rendered unusable before even you had seen them properly.
1. DC Geared motors
2. Wheels
3. Metallic chassis
4. L293D motor driver IC
5. DPDT switch
6. HT12E encoder IC
7. HT12D decoder IC
8. RF Rx-Tx Module
9. 12V Battery pack
10. Some basic tools and soldering iron.
Working Logic for the RC Robot Car
Here is a flowchart to help you understand the working logic of the robot car. There are two blocks…