David B. Thomas email@example.com March, 1999
In keeping with the tradition of my previous hacks, I use few parts and lots of tricks. All timing signals, including the timebase for the time of day and the clock for the microprocessor, are derived from the incoming video signal. That means if you lose power, or lose video, it loses the time... but in this home security application, that didn't matter. Lost power would mean the VCR stops recording and starts flashing 12:00 (1:00 during daylight savings).
Here is the
parts list and circuit description,
and most importantly the
PIC source code.
The code uses the Parallax instruction syntax, so you'll either need to use Parallax's SPASM.EXE (available for free on Parallax's web site) or Tech-Tools's CVASM16.EXE (available for evaluation on Tech-Tools's web site), or here is a preassembled object file, in INXH8M format, for use with any device programmer.
I don't have ready-made PC boards (yet), but I can send pre-programmed controllers. For more information, see the parts list.
Go to -DeeT's PIC Page.
David B. Thomas (firstname.lastname@example.org)