hi klass,
thanks for the scheme. it is like u know my problems.
while this helps my some more to understand what to do in my schematic, i beg that you help me out more.

i know i am asking much but if u could be giving me a bit by bit instruction on what to do, i will be very grateful.

for the MCU, is it possible to use one that has previously been used (i don't even know if it has internal code memory) ?
i was thinking that to avoid that possibility, i will use external code memory with the chip.
what do u think?

thanks,
Ehigie.