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sir i run your program it executed but my keypad is not working..i check all data and status & control pins voltages and connect keypad's pins properly as you told me.
after that i changed connections mean i connect all keypad's pins with all data pins but still no result.
i use "LPT" for...
thanks alot
plese guide me which pins of keypad connect with which number of pins of parallel port i mean i connect them only with data pins or i connect them with control or stadus pins too?
and have i need external supply?
---------- Post added at 10:42 ---------- Previous post was at 10:41...
I'm supposed to design and implement a simple circuit that will scan a 4-by-4 keypad and display the key pressed on computer screen. The catch of the whole project was that this was to be done using a standard parallel PC parallel printer port (DB-25), which was connected to a 4-by-4 keypad.
My...
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