WHY PARALLEL PORT? The simplest computer controlled robot Requires only basic programming skills in C to start off with Can take inputs from your robot and accordingly give output signals Circuitry is simple

Parallel Port

The Pins Data 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 Driver It 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 void main(void) { outportb(0x378,0xFF); } 0xFF= 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 address Go 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

The Motor

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 Links Parmon (