To help illuminate variation in light underwater I'd like to attach a turbidity sensor to the light logger I'm going to be redeploying when allowed. The sensor I'd planned on using ( here ) uses the onboard ADC to get voltages, which a formula converts to NTU. The issue is that this gives a very low …

As much as that would be nice I don't think it's realistic, I'd just like something that would reliably tell me whether the water is turbid enough to affect the light coming to the light sensor, and an index of how turbid it is. If I could get <1 NTU resolution that would be good enough. Even the p…

Why not buy a commercial sensor?

Cost basically. It's hard to get a hard price on them, but if Alibaba is any guide you're looking at $400+ for a commercial sensor. The portable turbidity meter I mention above is 1500AUD.

It looks like you have this sensor [image] DFR Turbidity Sensor Review & Thoughts - Codrey Electronics Turbidity sensors are widely used to measure the amount of suspended particles (turbidity) of the wash water in washing machines and dishwashers. In principle, turbidity sensor consists…

A photo transistor sensor isn't appropriate. Transistor gain is not well characterized. To measure light photo-diodes are used. A particular photodiode's response is much more stable as it only depends on the photons arriving, not other parameters like gain. I would suggest a good photodiode in a…

mikb55: It looks like you have this sensor DFR Turbidity Sensor Review & Thoughts - Codrey Electronics which is a simple light source and phototransistor receiver. The mechanical one piece design prevents you from increasing the sensitivity by simply increasing the path length. You could howeve…

The TLS237 seems very reasonable - the datasheet explains it uses a photo diode and then current to frequency converter, they know what they're doing! Constant current for an LED is available as a chip, there are various constant-current LED drivers around. Without constant current you may find …

Thanks for the tips. I had a try with what I've got here, and I can't do the mechanical precision required, but it's something I'll definitely try when I get access to a 3D printer, NTU standards and ultrapure water. I did some tests with the 16-Bit ADC added to the original sensor. Response is rea…

Choice of turbidity sensor options

Other Hardware Sensors

mikb55 August 27, 2020, 3:21pm 2

Is your goal to create a sensor that has the same performance as commercial turbidity sensors but at a fraction of the price?

Topic		Replies	Views
Problem receiving values from turbidity sensor Sensors	20	169	May 25, 2026
Problemas con sensor de turbidez Español	2	642	June 1, 2024
Formula for measuring sensor SEN0189 at 3.3 V Science and Measurement	6	1699	November 10, 2022
Measure water clarity has me stumpped General Guidance	19	226	September 10, 2025
ESP32 and Turbidity Sensor Problems Sensors	2	316	May 25, 2025

Choice of turbidity sensor options

Related topics