Introduction:
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 basics. PC parallel port can be damaged easily if you make mistakes in the circuits you connect to it. Safest bet is to buy an inexpensive I/O card which has an extra parallel port and use it for your experiment. If you manage to damage the parallel port on that card, replacing it is easy and inexpensive.
How to connect circuits to parallel 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.
The parallel port data pins are TTL outputs, that can both sink and source current. In ordinary parallel port implementations the data outputs are 74LS374 IC totem-pole TTL outputs which can source 2.6 mA and sink 24 mA.
8051 Project, 8051 projects,ADC0804,adc0808,adc0809,microcontroller projects, at89c51 projects, 8051 serial port communication
Wednesday, April 29, 2009
Parallel Port of PC
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Please note that my helps are not for free.
So, send me your problems and pay money for solution.ok
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