Brian McKevett

Project Question

Discussion created by Brian McKevett on Oct 8, 2007
Latest reply on Oct 15, 2007 by Alban Rampon
I'm looking to build a small project that consist of your typical quiz buzzer circuit with the addition of 4 or 5 timers.  I have built this project before and its just a mess to make on a proto board.  So I'm looking for a micro controller to help limit that. 
 
Here is the basic circuit, just half of what I need.
 
The micro would need 25 general IO for this porject, so I'm looking at the MC9S08GT8A in the 40pin dip.  I'm looking to use the internal clock, 8MHz is faster than it needs to be.  I hope this clock will be accurate enough for the timers, 5 sec, 30 sec, 60 sec, and 180 sec. 
 
From my preliminary check of the data sheet, this should work just fine.  But I'm hoping that the experts may see something that I'm missing.
 
Also can you give me an overview of what I would need to do programming to this micro?  As always cost is of the utmost importance.  Thanks.
 
 

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