Evening Bob,
All you need to add is a cheapie pocket DMM that reads current. Jameco
sells one
for 417.95.
Gee, I hope that decimal is a bit off. <grin>
I have a variety of good digital meters. Also, I have some Stand
alone 3/4 inch led type digital meters. They have
built in input selection and also the ability to select 1, 2, or 3 decimals.
I used these originally to show mmHg ( 0 to 50 ) with the output from a
motorola transducer. If I want to build one
nice and fancy unit, I could likely scale it to show ma with 2 or 3 decimals.
IF I ever decide to impress my friends, I might build a fully computer
controlled setup. I run a control system here
that has analog inputs, digital inputs and outputs, temperature sensors,
humidity sensors and event counters.
I even have some EC sensors that have analog outputs. I could day dream a
week before I started and use most of the hardware I already have. I even
have a sunlight sensor connected to this system. I control the heat in my
office with this same system. Its primary function is to control a 3/4 hp
motor that feeds my garden from a 500 gal nutrient tank.
The system is truly intelligent. I have seen it feed my plants, once per
day, 3 times per day, and up to 12 times per day.
The first week I ran it in the "intelligent mode", five days out of seven,
the first feeding of the day was 06:53 am.
I log all data every 7.5 minutes around the clock. Everything the system
does is data logged to a file. The program typically writes C binary files
but will write DBF files at the same time. ( well.... nearly the same time )
Max limit on this critter is near 20,000 monitor points. Presently I have
only 2 each 4 channel relay modules for turning things off and on.
I wrote all the software for this program. 10,000 lines of C code. The
program has run for 2 years without a lockup or a computer crash on the
same computer. The complete computer was built from my junk pile.
The super feature of this system is the LCD display that sits on my
desk. It is a 4 line unit. ( 20 columns per line )
Every 20 seconds this is updated with real time data from the system. This
works on two wires and a different serial port that the main program
uses. The main program runs on an RS-485 communication module.
I have not decided to apply all this to something as simple as flowing 3 ma
through some liquid. It would be fun I know, but I have been playing with
this control system for about 7 years. I am about to get bored with it.
1-800-831-424 Item #119212. They are very good, then you will know how
good the DW
is and when to shutoff.
I would like to do that. Will check out the item.
At one time, I thought I was retired, now I have found out I am not.
Thanks for your suggestions.
Wayne
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