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Raspberry pi and reading pH

Posted: Fri Nov 27, 2015 8:05 pm
by charlino10
A (cheapish!) solution for reading pH via a pi? (I was hoping for less than £50?)

Has anyone use this successfully? https://www.sparkyswidgets.com/portfoli ... interface/

There's some code but I'm not clever enough to understand it! (also only available on backorder right now)

Thanks,

Charli

Re: Raspberry pi and reading pH

Posted: Sat Nov 28, 2015 7:37 am
by BMS Doug
Note that he is selling an interface rather than the PH probe.

Once you have a PH probe you could build your own ADC interface (he has given directions how for ghose who prefer to make their own) but as I understand it the majority of the cost is in the probe.

Re: Raspberry pi and reading pH

Posted: Sat Nov 28, 2015 9:03 am
by charlino10
Oh yeh- am aware it is just an interface! Cheap pH probes on ebay are less than £10, and would be accurate enough for my purposes.

It is the interface bit I need- I can sort out an adc on the pi, but have never managed to get an op-amp working so I'd like that bit to be ready made!

Re: Raspberry pi and reading pH

Posted: Sat Nov 28, 2015 12:24 pm
by riklaunim
I have that I2C pH interface board - it works but that wasn't with RPi :)

Re: Raspberry pi and reading pH

Posted: Sat Nov 28, 2015 5:34 pm
by charlino10
riklaunim wrote:I have that I2C pH interface board - it works but that wasn't with RPi :)
That makes it all look really easy!