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Help with Brixometer design

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kaperdomo:
I have to make a brixometer/refractometer. This is a device used to measure the amount of sugar in a liquid. That's achieved by shining a ray of light through a piece of glass, and the light is refracted differently when the liquid has different levels of sugar in it.
The part I need help with is coming up with a circuit that will turn that refraction into an electrical signal and then showing it as the percentage of sugar in the liquid. So far, all I have is an LDR and an Arduino, but I realized I also need an LCD to display the number, and I'm not sure how to connect it, I would like to see if someone could help me with that. Also, if someone can come up with a better way, please let me know.

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strawberry:
Your circuit will have low resolution. I guess sugar in a liquid wont give much change in voltage for ADC

jbb:
An LDR might be the wrong tool for the job:
- I think a lot of them use Cadmium Sulphide (CdS) in the sensor. Cadmium is toxic and should be avoided
- you’ll only get a measurement at one point. Don’t refractometers offer a sort of bar output?

Maybe a linear photodiode array (or disassembled webcam) would be better?

jct:
Look at the following electronic hydrometers for a more accurate solution:
https://tilthydrometer.com and even some opensource: https://github.com/universam1/iSpindel

soldar:

--- Quote from: kaperdomo on June 09, 2019, 07:15:24 pm ---I have to make a brixometer/refractometer. This is a device used to measure the amount of sugar in a liquid. That's achieved by shining a ray of light through a piece of glass, and the light is refracted differently when the liquid has different levels of sugar in it.
The part I need help with is coming up with a circuit that will turn that refraction into an electrical signal and then showing it as the percentage of sugar in the liquid. So far, all I have is an LDR and an Arduino, but I realized I also need an LCD to display the number, and I'm not sure how to connect it, I would like to see if someone could help me with that. Also, if someone can come up with a better way, please let me know.
--- End quote ---

That circuit is a total non-starter. You are way over your head here.

Brix is more commonly measured by measuring specific gravity. Note that temperature also needs to be taken into account.

What range and what precision do you need?

Degrees Brix to Specific Gravity Conversion Tables
http://www.cobell.co.uk/uploads/downloads/SG%20Tables.pdf

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