Steve Kasm wrote:
>
> Is there a way to do this using another logic chip to control the reset
> or a transistor? I need to control this reset from another signal on my
> circuit. I posted a message about this to the [EE] board didn't think it
> was appropriate for this board. What I have from this point which is an
> inappropriate signal to work with is a rectified dc signal that as logic
> high is 41v dc and logic low is 14v dc. Somehow I need that 14v dc to
> reset the processor? I need my program to reset at this condition and
> I'm out of I/O pins on the processor to deal with this.


Sure, use two voltage dividers (4 resistors total)
and a logic chip, quad nand gate etc. Each voltage
divider is different, and each goes to a input pin.
At 30v+ dc both inputs are high,
at 14v dc one one logic gate is high.
Configure the gates with whatever chip you prefer
so that it generates a low output when the input
is 14v. :o)
-Roman

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