Current control only takes 2 transistors and a resistor or potentiometer.
In order for a voltage comparator to work, you must use current control
Ken
At 09:27 AM 7/30/01 -0500, you wrote:
>>>>
Morning Damian and QuiteCove,<<<<
Seems this would be easy with a computer and the proper input output hardware and software.
At my shop and office, I run a control system that logs temperature, sunlight, humidity, does event counting, has photobeams connected for datalogging, ect. I control the heat in my office with this system.
I have spare analog and digital channels. I have thought of doing exactly what you are suggesting.
My system is an RS-485 system, does communication on a single pair of wires. I have the modules all over the place and can in fact run and monitor the system from 3 different computers. Often I have two computers communicating with the system at the same time. Since this is a slow data system, ( 50 samples per second )
I seldom have a data packet collision.
It appears that one analog input and one digital output would handle this.
I also mastered parallel port control so..... this could be done with out any fancy expensive hardware.
All my software for this is written in C. My main program is over 10,000 lines and has run for 6 years without any problems.
Wayne
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