Parallel Port Tut

Parallel port tutorial Male Connector Æ D0 – D7 Data pins (8) S3 – S7 Status pins (5) C0 – C4 control pins (4) Rest all pins are grounded Female connector Æ (on computer) Copyright ® IIT Guwahati Robotics Club

Sending Commands to the Port:

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Sending commands involves only the data pins [D0 to D7 ] #include <dos.h> void main(){ outportb(0x378,0xFF);}

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(FF)16 = (1111 1111)2

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Sending Commands to the Port:

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Connect to motor: H bridge circuit 5V (for IC)

12V (for motor)

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L293D

Driving the DC motor:

outportb(0x378,0x00);--------outportb(0x378,0x03);--------outportb(0x378,0x01);--------outportb(0x378,0x02);--------Copyright ® IIT Guwahati Robotics Club

STOP STOP MOVE MOVE

MOTOR MOTOR Break! MOTOR(CCW) MOTOR(CW) .

Some tips „

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Windows XP doesn’t allow to directly access the parallel port so we have to use third party drivers which opens the specific ports. One such software is Userport. http://www.embeddedtronics.com/public/Electronics/minidaq/userport/UserPort.zip

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Generally the address of the parallel port is 0x378-0x37F. If not the check its address in the specific port properties in device manager.

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