infinkc said:
pic would be alot cheaper, you can use a pic12c508 or 12c509 that has an internal oscillator, and program it very easily, you would need an transistor for the outputs and a voltage regulator also. total cost would be about $6-8 if that.
Heck, even the PIC10F200 should be able to do this as well. Not a big deal they are both $0.50.
My thoughts are for 12 V in and Ground. Also unhook the illumination wire from the Z1 and plug it into this device. Then one output, the illumination wire to the Z1.
You need 1 processor, 1 5V regulator. Maybe a couple of resistors for a voltage divider for the illumination input to a input pin on the processor. And a fet to connect the 12 V which was the input for this and the regulator to the illumination out. (haven't worked out all this in my head or drawn it up yet). I'm sure theres a cap or so too also which won't be a bad idea.
Then you can disreguard the illumination in line for the first 5 seconds after power on. You turn on, wait 3 seconds, turn on the headlights for 1 second, then turn them off for 1 second. Then turn on or off the illumination out based on what you see on the illumination in. Then you don't need any diode or anything to "protect" the illumination in.
I do have a Z1 and the single turn on and off works. I have tried it and it does work. The only reason you would need more is incase we have the timing off. I'm guessing on the 3 second wait, 1 second on and 1 second off. But that should be real close.
Should be a rather easy project. I won't be able to really work on it till Monday when I'm supposed to be working.
Any thoughts? I like this idea better than just a turn on and off the line and then it's dumb and you need to hook the illumination line with a diode or something.