Are you assuming a PIC is a picture? I was referring to a Programmable Computer chip. Here's a quik description I posted the other day.
Posted January 19, 2012 01:50 PM Hide Post
All my designs use PICs. For those not familiar with it a PIC is a complete computer on a chip, ie; processor, memory, I/O. For this circuit I used a Microchip 12F508. It's an 8 pin DIP that costs 50 cents. Microchip now has a cheaper one the 10F200 for 30 cents. So basically you write some software to do what you want. In this case read the ambient level and use that as normal level. Adding some filtering and some hold delay is just a few more lines of code.
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