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Gerad
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Joined: 10/01/2024
Location: Germany
Posts: 49

Posted: 10:36am 30 Mar 2024

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Hello
Does anyone have experience with PH measurement?
and/or EC measurement with Webmite?
Or know where I can find information?

THX
Gerad

NPHighview

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Joined: 02/09/2020
Location: United States
Posts: 203

Posted: 03:11pm 30 Mar 2024

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Greetings, Gerad -

Is this the sort of thing you're looking for?

https://circuitdigest.com/microcontroller-projects/arduino-ph-meter discusses obtaining pH.

https://www.electroniclinic.com/arduino-hydroponics-diy-hydroponics-system-using-ph-sensor-ec-sensor-hydroponic/ discusses obtaining both pH and EC

You will need to substitute "WebMite" and "PicoBasic" for "Arduino", but the approach should be very similar.

Live in the Future. It's Just Starting Now!

Gerad
Regular Member

Joined: 10/01/2024
Location: Germany
Posts: 49

Posted: 07:20pm 30 Mar 2024

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Hello NPHighview

Thanks for your tip
I will try with micropython or circuitpython.

regards
gerad

NPHighview

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Joined: 02/09/2020
Location: United States
Posts: 203

Posted: 03:30pm 31 Mar 2024

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You don't have to do that! <<shudder!>> Just use the same circuitry, and pattern your code after their examples.

Live in the Future. It's Just Starting Now!

stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2566

Posted: 04:40pm 31 Mar 2024

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I bought this ph tester and it works but don't know how?? no batteries.

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5089

Posted: 05:29pm 31 Mar 2024

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Chemistry. 2 different metal electrodes, acid, creates a voltage. That is how lead acid batteries work.

Volhout

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zeitfest
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Joined: 31/07/2019
Location: Australia
Posts: 581

Posted: 11:54am 01 Apr 2024

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This diy meter may b worth a try...I was going to build the older version using a INA116 as was suggested, but didn't get to it. You will still have to read the 140mv output, and get the special glass+counter electrode combo as well. Precise work will need calibrations etc

stanleyella

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Joined: 25/06/2022
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Posted: 01:47pm 01 Apr 2024

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Volhout said Chemistry. 2 different metal electrodes, acid, creates a voltage. That is how lead acid batteries work.

Volhout

lead acid is one metal.
search 2 dissimilar metals

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
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Posted: 01:57pm 01 Apr 2024

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It's a single metal if the battery is flat. When charged one electrode is lead and the other is lead oxide. The electrolyte is then concentrated sulphuric acid.

A better example might have been a piece of copper wire and a zinc-plated nail stuck in a lemon. It's a very simple primary cell. The voltage will depend to some extent on how strong the lemon juice is. You can try copper and zinc in various electrolytes to see the change.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

stanleyella

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Joined: 25/06/2022
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Posted: 03:38pm 01 Apr 2024

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Mixtel90 said It's a single metal if the battery is flat. When charged one electrode is lead and the other is lead oxide. The electrolyte is then concentrated sulphuric acid.

A better example might have been a piece of copper wire and a zinc-plated nail stuck in a lemon. It's a very simple primary cell. The voltage will depend to some extent on how strong the lemon juice is. You can try copper and zinc in various electrolytes to see the change.

I think it's lead peroxide
hydrogen peroxide h2o2
hydrogen oxide h2o

Mixtel90

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Posted: 03:56pm 01 Apr 2024

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Sorry, it's lead dioxide. :)

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

stanleyella

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Joined: 25/06/2022
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Posted: 04:44pm 01 Apr 2024

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and it's not concentrated h2so4 but drop this, who cares :)

Mixtel90

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Posted: 06:28pm 01 Apr 2024

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Well, it becomes more concentrated as the battery charges and that changes the specific gravity rather conveniently, but yeah, lets. :)

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

zeitfest
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Joined: 31/07/2019
Location: Australia
Posts: 581

Posted: 10:24pm 01 Apr 2024

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The electrodes look like copper and another metal. It might be a so-called "Clarke cell", using an antimony/oxide electrode. It was cheap and used for measuring oxygen levels, but depended strongly on pH, temperature, etc and had poor results.
Edited 2024-04-02 08:25 by zeitfest

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