TECHNICAL DETAILS:

Basic components used or to be used:

Motors, An aluminum bot frame, PCBs, receiver – transmitter pair, antennae, ICs such as 8051, L293D (motor driver IC), HT12D (Decoder IC), HT12E (Encoder IC)


Programming Language Used: Visual Basic 6

Using Visual basic 6, a user virtual interface will be created where the user can continuously see through the bot’s eyes (through the camera installed on the bot).The user is given with a set of command buttons such as move forward, turn left….and so on, by pressing a key or by clicking on them the user can make the bot move forward, left respectively.

This will be achieved by using the MsComm control of visual basic and by using simple events such as On_comm event. Using On_comm event initially the baud rate, the number of data bits, parity etc will be defined. And by simple programming using Command_click event bits can be bits can be transmitted on the serial port of the computer.

Using an RS-232 cable we will connect this serial port to our transmitter circuit board.
The data signal from the serial port will first be given to 89C51 microprocessor IC. Here the data signal will be converted in the desired form that will be given to the motor driver IC to drive the motors as per the want. To this microprocessor IC an encoder will be connected which will encode the data signal (2^n to n data bit conversion). The encoder IC takes in parallel data at the TX side packages it into serial format and then transmits it with the help of a RF transmitter module. We are using HT12E as our encoder. This encoder IC is connected to Transmitter chip. (We have bought a readymade transmitter-receiver pair known as A434.This transmitter receiver pair uses ASK (Amplitude Shift Keying) for its working operating at 433Mhz.).

At the receiver end, the decoder IC receives the signal via the RF receiver module, decodes the serial data and reproduces the original data in the parallel format. This parallel format data will now be given to another 89c51 microprocessor. Here it will process the data and produce output data signals on a port say p2. The microprocessor is so programmed that it drives L293D and it is connected as per. L293D is basically quadruple high-current half-H. The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. Thus for each different signal, motors are driven differentially and since the motors are connected to wheels, the bot moves accordingly.

Also separately a camera ( bought readymade) will also be installed on our bot to view its front direction. This camera will be a wireless camera with a range of about 80-100m. (A sort of wireless webcam).Also the receiver of the camera will be connected to a USB port of the computer. Using a TV tuner card video from the camera will be streamed on the computer.