> Can someone please tell me a way to connect
> eight momentary action pushbuttons to a PIC so
> that each button will light a corresponding LED,
> while locking out the other seven switches and their
> respective LEDs? This will be used as the basis of a
> kind of 'quiz-game adjudicator' to detect the
> first button press only

Hi,

I would use a 16F84 and set PORTB as all inputs and
wait for a button in a short loop. As there is a
possibility of a tie (more than one button in
10uSecs), you would need to arbitrate and a random
pick would probably do OK.

After a button is detected, I would then change PORTB
winner to an output and display the winning LED. There
would be some hardware considerations to stop the
buttons from operating the LEDs.

Then a reset button, using PORTA would start over
again.

Jeff Johnson
http://home.dialix.com/~u2263/index.htm


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