[time-nuts] Thunderbolt Monitor (Didier Juges)

David Medin dtmspam at techemail.com
Sat Sep 13 16:24:41 EDT 2008


   When I get my Tbolt, I was planning to program a PIC18F6722-based board
   I have already designed and produced, into the role of passthru/monitor
   to indicate lock. What other features would everyone want to see on a
   Tbolt monitor board relative to features/displays? What kit price range
   would you consider workable? I already have some similar RS-232
   supervisory stuff programmed in Assembler for the board similar to what
   a Tbolt supervisor would probably have. The board supports discrete
   LEDs as well as the usual parallel LCD character display--currently a
   20X4 matrix available from numerous sources like Crystalfontz and
   others. The board is based on +5 volts.

   If there was enough interest in a board, I probably would port the code
   to a smaller 18FxxKxx-series processor, as the price of the 6722 has
   gone through the roof and about 90 percent of the code space is unused.
   The K-series in SOIC-28  is also much easier to hand solder! I'd just
   have to work out a negative LCD bias supply as the K runs on 3.6 volts
   maximum.

   I wouldn't mind releasing the source code I've written too, if that
   made things more customizable. The Assembler is free from Microchip.

   I'm a bit busy at the moment, but could tend to customizations in
   November/December (depends somewhat on when my Tbolt arrives!). Scale
   of production greatly affects the cost, tho.

   -Dave Medin
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