[Sdcc-user] help with Home Alarm System

[Tony P. <ap...@pa...>]

I would like to know if the 8051 can run two thing at the same time. In my
alarm when they open the front door the person had 30 sec. to turn it off. I
need a 30 sec delay and at the same time check to see if the code enter is
correct. If they do not put in the correct code the alrm sound,  but if they
do put in the right code turn the system off. what do i need to make this
work?