Reverse candle program

[gadget-evilusions]

It's that time of year, and with the amount of programming and prop installs I am doing I am going to need loads of help for the next month.

First project: I have 2 - 12v led bulbs, 30ma draw. I want to flicker them in the opposite fashion that the standard wick led program does. The standard program flickers the outputs with the standard state of the output as off. I would like to do the opposite, where the output is normally on, and randomly flickering off. Unfortunately I am not sure how to exactly translate what I want into words. I tried to reverse the standard program, but there are values in it that I am not 100% sure of.

[JonnyMac]

Actually, the standard LED program just sends random bits to the outputs; what you may want to do is change the timing. I would suggest making it faster than normal.

[JackMan]

Another option would be to use a normally closed relay for the LED circuit. The output for the flicker program would then turn the LED's off instead of on.

[JonnyMac]

The candles program loop runs every 25 to 75ms so it would not be good to use a relay.

[JackMan]

With the loop running at that speed would anyone really notice if the "normal" state was on or off? I guess I misinterpreted the original question.

[JonnyMac]

This is my point: the candles program simply writes a random value to the outputs -- the bits in the value determine on and off.  The fact that the normal candle circuit uses a capacitor to smooth things helps create the effect.  It might also help when using an incandescent.

[gadget-evilusions]

I modified the program to do what I needed and to get the effect I saw in my head. I will post it this weekend.

Thanks