reading parallel port and display

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ashutosh143342

Disciple
Mar 12, 2008
8
0
0
hi guys
Iam a final yr engg student and I have to ake a project in which i have to record the speed of a moving object and to display it on computer.so i decided doing it using parallel port.
but i a novice in this so kindly help me
how to take input from parallel port and what kind of input will it read
 
H

hammerhead

Adept
Jun 26, 2006
683
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37
www.teamreflex.org
Okay I have no idea what a tachometer or a optical counter circuit is (as I am not from Electronics) but there there are a few techniques like using a shaft encoder or stepper motors for measuring speed.

If you want to record speed of generic objects you can use IR sensors at a known distance from each other and calculate the time taken by the object to pass through both the sensors.
 
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ashutosh143342

Disciple
Mar 12, 2008
8
0
0
ya ir sensors too can be used....but how to use the signal as a input and then display the speed.
what should be done suppose i will use ir sensors only.
 
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hammerhead

Adept
Jun 26, 2006
683
26
0
37
www.teamreflex.org
The only method I know is by connecting the sensor with the ADC of a microcontroller and then programming the microcontroller to check the input from the sensors and pass the corresponding output to the parallel port. If there is a method without the microcontroller then maybe some electronics guy will be able to help you out.
 
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ashutosh143342

Disciple
Mar 12, 2008
8
0
0
Well i can make any circuit on pcb wid given circuit diagram.No idea of programming as iam frm mech branch.But i have basic knowledge about programming in c,basic idea abt microcontrollers
 
H

hammerhead

Adept
Jun 26, 2006
683
26
0
37
www.teamreflex.org
First you need to understand how to program a microcontroller. Its not that difficult, I would suggest either 8051 based AT89S51 or AVR based ATmega16 or ATMega8 because these are the only ones I know. Try searching your library for the books or try this link AVR Freaks

Irrespective of what language you learn to program, the output will be a .hex file or a .eeprom file that you will be required to burn on to the microcontroller, again if the microcontroller is ISP supported (all ATmega series) you will need to make a little circuit to burn it. If not then you will need a programmer to burn it, that can be found at your electronics lab.

Additionaly you may require a 5V and Gnd power supply circuit. Once you have done this much you will be good to go. I will warn you if you are looking for a short time project you will have to work real hard and fast.
 
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ashutosh143342

Disciple
Mar 12, 2008
8
0
0
Well iam going market tommorow to buy the stuff.I have nearly 2 weeks left and market is 9 hrs away frm here so could u tell me what r the components to buy.
 
WingZero

WingZero

Skilled
Jun 24, 2007
2,716
124
152
USA
@hammerhead tachometer measures rpm..
@ashutosh EFY-electronics for you...has important article on same....givin display thru parallel port n display covering everythin dun remember the issue...shud b dis month or feb...retails for 35buxx
 
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