Hello!!!

I am in project with 16F877/04 and I having some problems with=20
interruptions. They are configured as follows:

-> Timer0 is updating multiplexed led displays, reading keyboard,
and make calculations from ADC, all every 5ms

-> Compare2 is detecting zero-crossing from AC, to fire a TRIAC by
cycle completed. TRIAC is powering a load via PID

-> Timer2 is fired by Capture2 to fire the TRIAC for 2ms, 115.o later
zero-crossing, to power load allways with 110 VAC (the Timer2 itself
makes 5ms to fire and 2ms to optocoupler still activated).=20

The problem is a "flicker effect" on led displays. The data is correct,
but the brightness is floating, and generating noise that is shifting=20
the syncronism signal.=20

Someone had seen this problem?

I have used display multiplexing with Timer0 without zero-crossing
with no problems. In other work, same with zero-crossing, but using
other display way. But, using both with Timer0 is the problem.

I accept suggestions!!

Tanks in advance.... JB

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics