i am doing a project and having some trouble programming the 8051 for a keycode. i am using 4 push buttons and want to use the ports on the microcontroller for the keycode. i want to be able to set the keycode and then use the buttons to access the code and then display it to an lcd but if the code isnt right i want it to print wrong code to the lcd. i am using the keil software but programming it in c. i have the lcd working and able to print stuff to it but lost now that i am trying to get the key code working. Any suggestions?

 

How exactly are the buttons connected to the port?
Do you know about de-bouncing switches?

 

Please don't do multiple posts on the same subject.

 

Try not to post in too many places at once. I think I put the answer here:
http://forum.allaboutcircuits.com/showthread.php?t=90210

But perhaps it should be moved to this forum instead. Oops.