……computer controlled robot

WHY PARALLEL PORT?The simplest computer controlled robotRequires only basic programming skills in C

to start off withCan take inputs from your robot and

accordingly give output signalsCircuitry is simple

The PinsData Register:This is the register that allows the user to

write values into the port. Status Register (Pins):This port acts like a reader and it has 5

pins for inputs.Control Register (Pins):This register can be used in both ways: it

enables a user to write values to the outside world, as well as read values

What is High and Low?A Parallel port uses Transistor Transistor

Logic.A high signal i.e.1 means the output of the

transistor arrangement is from 2.2V to 5V.A low signal i.e.0 means the output of the

transistor arrangement is from 0.0V to 0.8V.

Motor DriverIt acts as an interface between the port and

motor.The output of the parallel port is too low to

drive a motor.The motor driver receives signals(1 or 0)

from the port and gives an output to the motor.

L293D(Motor Driver)

Programming#include<stdio.h>#include <dos.h>

void main(void){ outportb(0x378,0xFF); }0xFF=1111 1111 outportb(0x378,0x00); ---------STOP MOTOR outportb(0x378,0x03);---------MOVE MOTOR(Break!)) outportb(0x378,0x01);---------MOVE MOTOR(CCW) outportb(0x378,0x02);---------MOVE MOTOR(CW) .

Finding the addressGo to Start > Control Panel > System >

‘Hardware’ Tab > Click on Device Manager > Look for ‘Ports’ in the device list > Double click on LPT1 > Click on the ‘Resources’ Tab.

Here you can see the starting address of I/O Range.

It is usually 0x378 or 0x278

Materials Required:1 parallel port Male connector 1 DC Motor 1 Motor Driver [L293D] 1 5V regulator [7805]Warning:Your Parallel port is not designed to handle

more than 5V.

Useful Software and LinksParmon(www.geekhideout.com/downloads/parmon.zip)www.machinegrid.com