KEYESTUDIO Turbidity Sensor Module V1 for Arduino,Water Quality Monitor Particles Water/Liquid Turbidity Level Tester

I saw before I bought it that I couldn't submerge it, so I'm not knocking a star off for that. I think it could be sealed with hot glue, but my guess is that the sensor generates enough heat which might generate condensation.The sensor itself is fantastic and tells you how "clear" the water is. I used example code that D. Porreyposted (Thanks D!) and was up and running quickly. I bought this, along with the TDS sensor to measure the contaminates of my water in my laser cutter cooling system. These two together seem to be a great combo since the readings are consistent and instant. They will tell me when my water is starting to look not so fresh, since it's in a place where I can't see it without some effort. I hooked this up to an arduino and sent the data to Node Red so I have a digital gauge showing my water condition on the phone.

Turbidity vs concentration follows a cubic fit over an extended range, which is convenient. The main issue is that, as noted, the meter is NOT waterproof. It would be nice to have the option to pay more and have that feature!

used it to measure turbidity in a local water body, easy to use, worked well.

I tested this on an Arduino Uno using port A0. Connect the black wire to ground, the red wire to 5V and the yellow wire to A0. Here is a very simple program.void setup(){Serial.begin(115200);}void loop(){float value = analogRead(A0);Serial.println(value * (5.0 / 1024.0));delay(1500);}The code is easy enough to write. Just read the port and multiple the value by .0049 (or 5.0 / 1024.0 for a 10-bit analog converter) to get the voltage.There is a switch to change between analog and digital mode. In digital mode, the output is either HIGH or LOW. On analog mode the output is a voltage that can be read on an analog port.In digital mode, I measured the output at 5.0V when the water is clear/clean. With the sensor completely blocked the output is .049V (or essentially 0). In digital mode, the amount of turbidity to trigger the output can be adjusted by turning a potentiometer on the board. This is a single turn device, so the adjustment is course, but it works well. I used filtered water from a reverse osmosis filter as my control water test. If you need to determine when a particular water sample is at a specified turbidity level, you could easily take a sample (or make a sample) and then adjust the sensitivity until you hit the trigger point.In analog mode, the output voltage is 3.92V when the sensor is in clear water. When pulled out of the water in dry air it reads 3.3V. This seemed a bit strange to me but since this is a water sensor, the dry air reading is irrelevant. I would expect, though, in clean water that reading be at or near the 5V level. This means that the overall sensitivity of the sensor is slightly diminished. With ½ gram of hot chocolate mix in 8 oz of water I was saw the reading change to 3.3 V. 2% milk has a reading of 0.77V. Using various mixtures, I was able to obtain a variety of readings that coincided with the level of visual turbidity. I did not translate the measurements into true readings mainly because I do not have any standards to measure against.The fact that this device cannot be submerged makes it somewhat difficult to use. You will have to design mount perhaps using a 3D printer. While testing I slid the edge of the plastic cup between the sensor and the black clip. This will work if the edge of your container is very thin. I would give the 4 stars if it had a better option for mounting it or if it could be submerged.The sensor is simple to use and offers two modes. I cannot say it is accurate but if you just need to detect if water has something in it when it should be clear, this is an inexpensive option.

I originally bought this sensor to use inside my fishtank in order to evaluate the quality of the water. The sensor works great, and I am able to receive readings consistent with test strips. However, the sensor part of this product is not completely water proof. This feels counterintuitive, but I ended up fixing it to a piece of foam as to keep the correct part in the water.

This sensor registers differences in additives in liquids. I tested this sensor with water from the tap and coffee and found that the sensor did indeed return different values. I also found that a mixture of coffee and water produced values in between pure water and coffee so this sensor definitely does change due to the purity of water. I found that the more pure the water the higher the reading and the less pure it was, the lower the reading. I also found that if I varied the amount of coffee I put in the coffee and water combination but just a little bit, I got different readings. So, I think this sensor can note fairly small changes in difference of water purity. I note that this sensor cannot be fully submerged a factor you will have to consider when using this sensor in your project.

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Works well enough for Arduino projects. I don't suspect that it's lab quality. However, it's a fun tool to use to assess water quality.