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Old 01-28-2013, 02:24 PM   #1
Ppeg34
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Default Arduino pH Meter

I couldn't find much about people using arduino (or any microcontroller for that matter) to monitor pH.

I stumbled across this unit on e-bay: http://www.ebay.com/itm/pH-Circuit-S...-/200779624796

It says it has temperature independent and dependent readings.

It says that the pH probe would not be able to handle boiling temperatures, but that the circuit can?



Any more insight you all can give would be greatly appreciated.

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Old 01-28-2013, 02:27 PM   #2
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I actually think I misread it. The kit is $110 http://www.ebay.com/itm/pH-Kit-Senso...item2c663741cb

The link in the above post is just for the sensor. I am still interested even though it is $110, though

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Old 01-28-2013, 02:48 PM   #3
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Any microcontroller should work. The real cost of a pH monitoring setup is in the probe. Most pH probes are made of very thin glass. Despite their craftsmenship they are nothing more than electrodes. Inside the probe is a salt solution and a submerged electrode. The outside like I said was very thin glass and when it is submerged in a solution a voltage potential is created between the solutions inside and outside the probe.

Theoretically you should be able to buy any replacement probe, hook it up to the arduino and measure the voltage across the electrode and then using the Nernst equation be able to calculate the pH of the solution. If you have a thermometer in the same solution you can input that into the calculation rather than always measuring at the same temperature.

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Old 01-28-2013, 04:07 PM   #4
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Quote:
Originally Posted by Leithoa View Post
Any microcontroller should work. The real cost of a pH monitoring setup is in the probe. Most pH probes are made of very thin glass. Despite their craftsmenship they are nothing more than electrodes. Inside the probe is a salt solution and a submerged electrode. The outside like I said was very thin glass and when it is submerged in a solution a voltage potential is created between the solutions inside and outside the probe.

Theoretically you should be able to buy any replacement probe, hook it up to the arduino and measure the voltage across the electrode and then using the Nernst equation be able to calculate the pH of the solution. If you have a thermometer in the same solution you can input that into the calculation rather than always measuring at the same temperature.
Really, really great info.

Thanks for the thoughts.
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Old 01-28-2013, 08:47 PM   #5
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Found a few kits/sheilds that might be along the lines of what you want.
http://www.robotshop.com/bnc-ph-sens...arduino-3.html
https://www.sparkfun.com/products/10972

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Old 01-28-2013, 09:12 PM   #6
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I understand the appeal but I got the milwaukee mw102 with buffers, cleaning solution and storage solution under $117 shipped.

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Old 02-01-2013, 04:44 PM   #7
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I just made an arduino ph monitoring tutorial a while back

http://rezaalihussain.blogspot.com/2...-tutorial.html

I'm in the process of writing a tutorial on using an arduino to control ph, anything u would like to see?

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