Re: using PARALLEL PORTS to measure ac and dc voltages -- Zahid Iqbal

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Subject: Re: using PARALLEL PORTS to measure ac and dc voltages

Author:
narender

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Date Posted: 07:01:50 08/17/05 Wed
Author Host/IP: 219.64.67.58.HYD-CDMA.dialup.vsnl.net.in/219.64.67.58
In reply to: Ismail Nasar 's message, "ON THE PARALLEL PORTS IN C LANGUGE USEING WINDOW 98" on 06:54:26 07/25/05 Mon

hello sir, i am doing a study project to measure ac or dc voltages in a computer using pc's parralel port and the code written in c language. the problem is that i have to read 8 bits but parallel port has only 5 input bits. and also how to convert that read binary digits using c language into voltage . can u please help me with a good sample program explaining the above program.

i will be very thankfull to u if u can help me with a circuit diagram and the necessary code for this project of u have it or the link where it is available .

please help me.

thank.uu ....

bye

narender

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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