Abstract:

The main aim of the project is to design a robot which can be controlled through PC and by using wireless RF communication. Here the front end application will also be developed on C# .NET platform for the visual effects so that the application can be easily accessed.

           The RF modules used here are STT-433 MHz Transmitter along with an RF encoder HT12E, STR-433 MHz Receiver along with an RF decoder HT12D.

          The project is designed in such a way that a PC will be interfaced to the controller through serial communication, using which we will input the predefined commands to the controller by using the hyper terminal of PC, to control the robot in different directions. Here we will use a serial line driver IC MAX232   to interface the PC with controller. The RF transmitter is also interfaced to the controller through an RF encoder to encode the data received by the controller and to transmit the data. Hence the encoded data will be transmitted by the transmitter over the wireless medium and will be received by the RF receiver which will be interfaced to the controller through an RF decoder, on the receiver side. The RF decoder is used to decode the received data into a 4 bit digital data which will be fed to the controller. And a physical structure which is designed by two motors and which mimics the robot will also be interfaced to the controller. Now,  it is the job of the controller to read the data received from the decoder and to  perform the predefined task of moving the robot I different directions.16X2 LCD is provided at the receiver side to display the status robot.

For  the visual effects, the front end will also be developed by using a good user interface software C#.NET to input the data to the controller through serial communication, on transmitter side. Here we will design 4 buttons with labels front, back, left, right and stop. By clicking on these buttons the corresponding data will be passed to the controller serially.                  This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay.7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

RF transmitter             :           STT-433 MHz

RF receiver                 :           STT-433 MHz

RF encoder                 :           HT12E

RF decoder                 :           HT12D

Driver IC                     :           L293D

DC motors

PC

Driver IC                     :           MAX232

Power supply

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805

SOFTWARE:

Keil micro vision

proteus

UC flash

.NET

APPLICATIONS:

• Industrial applications
• Robotic applications
• military