ON THE PARALLEL PORTS IN C LANGUGE USEING WINDOW 98 -- Zahid Iqbal

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Subject: ON THE PARALLEL PORTS IN C LANGUGE USEING WINDOW 98

Author:
Ismail Nasar

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Date Posted: 06:54:26 07/25/05 Mon
Author Host/IP: NoHost/202.176.230.70

hello it is ismail nasar once again in our fourm tigerpk.tk
PC parallel port can be very useful I/O channel for connecting your own circuits to PC. The PC's parallel port can be used to perform some very amusing hardware interfacing experiments. The port is very easy to use when you first understand some basic tricks. This document tries to show those tricks in easy to understand way.

DONT ABOUSE ME IF U MAKE MISTAK
WARNING: PC parallel port can be damaged quite easily if you make mistakes in the circuits you connect to it. If the parallel port is integrated to the motherboard (like in many new computers) repairing damaged parallel port may be expensive (in many cases it it is cheaper to replace the whole motherborard than repair that port). PC parallel port is 25 pin D-shaped female connector in the back of the computer. It is normally used for connecting computer to printer, but many other types of hardware for that port is available today.

Not all 25 are needed always. Usually you can easily do with only 8 output pins (data lines) and signal ground. I have presented those pins in the table below. Those output pins are adequate for many purposes.

pin function
2 D0
3 D1
4 D2
5 D3
6 D4
7 D5
8 D6
9 D7

Pins 18,19,20,21,22,23,24 and 25 are all ground pins.
Those datapins are TTL level output pins. This means that they put out ideally 0V when they are in low logic level (0) and +5V when they are in high logic level (1). In real world the voltages can be something different from ideal when the circuit is loaded. The output current capacity of the parallel port is limited to only few milliamperes.

Dn Out ------+
|+
Sourcing Load (up to 2.6 mA @ 2.4 v)
|-
Ground ------+

PROBLEM IS THAT HOW WE CALCULATE UR OWN DATA TO BE SEND BY PARALLEL PORTS
You have to think the value you give to the program as a binary number. Every bit of the binary number control one output bit. The following table describes the relation of the bits, parallel port output pins and the value of those bits.

Pin 2 3 4 5 6 7 8 9
Bit D0 D1 D2 D3 D4 D5 D6 D7
Value 1 2 4 8 16 32 64 128

For example if you want to set pins 2 and 3 to logic 1 (led on) then you have to output value 1+2=3. If you want to set on pins 3,5 and 6 then you need to output value 2+8+16=26. In this way you can calculate the value for any bit combination you want to output

APPREATUSE TO NEED
1 PARALLEL PORTS WIRE

2 2LEDes
3 BREAD BORD
here is the programm
#include
#include
#include
void main (void)
{
clrscr();
printf("the LED 1 should be ON");
getche();
outport(888,2); /////the LED conection should be with pin3
printf("the LED 1 shoud be OFF);
getche();
outport(888,0);
printf(the LED 2 should be ON);
getche();
outport(888,8); ///the conection of LED1 should be with pin 5
printf("the LED 2 shoud be OFF);
getche();
outport(888,0);
getch();
}
as u know the parrlell port send maxiumm 8 volatege
by a pin which is enough for LED
the connection of wire should be with one from parallel and one from ground the ground provise -ve

by this way u can ON LED useing LED
pray from me
ismail nasar
BIT quetta

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Replies:

Subject	Author	Date
Re: using PARALLEL PORTS to measure ac and dc voltages	narender	07:01:50 08/17/05 Wed