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This sounds like an interesting project. I remember seeing a schematic for a ph probe interface somewhere on the web. I will try and find it and post a link to it. Being an electronics tech I should be able to help with making pc boards for the ph probe interface etc. Any web or pc interface for these boards? Would be nice to log temps and ph etc to a pc for review. My biggest problem is finding time to do all the research.
Rob |
#2
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Quote:
A web interface is difficult. There are network interfaces but then you'd have to code a web server entirely in assembly. It might be easier to instead set up a client-server relationship where software's run on the PC and the controller sends data to the software. I thought about ordering a USB and network interface but I'll be so busy just learning the Atmel assembly that I wouldn't use them right away.
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Everything I put in my tank is fully dependant on me. |
#3
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I did find one schematic so far for a ph probe. The output from the circuit is 0-140mv which corresponds to the ph value. No link to the probe used though.
http://damien.douxchamps.net/elec/ph_meter/ Assembly language! I haven't used that in more than 20 years. I do remember it was fun once I figured out the codes etc. That was for the 8085 microprocessor. Time to start reading! |
#4
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Kwirky, once you get them running, sounds like a cheap little controller you could market to fellow reefers.
Robw, I was looking for the output for figuring the slope/intercept for a pH probe awhile back (was hooking to a datalogger) and got this e-mail from American Marine (AMI): "After proper calibration the probe will generate 59 mV per each unit of positive pH and the opposite will be negative mV. Example pH 7.0= 0 mV; a ph of 8.0=59mV a pH of 6.5= -30mV Good Luck...Lou Dell/AMI" |
#5
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Did he by any chance explain how to correct for temperature with this? The closest I've ever found to a bona fide reference is the table on the back of pinpoint's calibration packets and I bet that doesn't necessarily correspond with SW.
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#6
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with the temperature we run our aquariums at temperature callibration is almost negligable. I saw a chart somewhere once and it's like a 2% difference. (ph 8.302 instead of 8.297)
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Everything I put in my tank is fully dependant on me. |
#7
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Here is a schematic I just did up for an Orp interface
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500G Mixed Reef __________________________________ Electrician, Electronics Technician, I can help with any electrical questions you might have!! __________________________________ Kevin Last edited by KrazyKuch; 02-15-2008 at 04:29 PM. |