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Hydroponics board EC resistance


 
 
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Old 04-07-2018, 06:04 AM
steviebradan steviebradan is offline
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Join Date: Apr 2018
Posts: 6
Default Hydroponics board EC resistance

HI,

I have the hydroponics board from cooking hacks and I received it with both the EC and pH probes.
Everything was working fine with the EC until I changed the probe. Even though I recalibrate with the new probe, the value is off by a few points (I double check with a separate digital EC probe).After digging in the code and understanding the equation I see that the missing link is calculating the resistance.In the repository the resistance is calculated with values that "Have been obtained experimentally" (Pasted below) and I have no clue how to obtain them myself.My question then is: - Are these values dependent on the probe as well as the circuit? For this reason, another probe would need different values?If this is the case, how can I replicate the experiments to get it with a different probe?

Please help.

I did not find the right solution from the internet.

References:-
https://www.cooking-hacks.com/forum/...p?f=43&t=10809
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