Voltage Change = Execute Script/Program

[Billy Pollifrone]

If you are looking for seeing if a signal is high or low, you can use the
parallel port for this with the parallel port library PARAPIN. There is a
warning I must give that if you are not careful, you may end up breaking
your motherboard's parallel port. If you are careful though, you can
implement this will minimal cost.

A safer approach is to use an external circuit that will deliver the
readings to the PC via serial, usb or GPIB. There is, of course, a cost
involved in this.

On 2/12/06, Tod Merley <todbot88 at gmail.com> wrote:
>
> The voltage change (yet to be designed - lots of flexibility here - for
> example we could make it +12vDC @ 300ohms <+12vDC at 300ohms> = high and -12vDC
> @ 300ohms <+12vDC at 300ohms> = low  as in classic RS-232 or we could use a
> "pull up" resistor into a CMOS/TTL type device.
>
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