• James8887

Katie4842

There are also non-contact measurement methods, capacitive and inductive. The inductive method can be easily implemented on a microcontroller with two built-in comparators, resulting in an autogenerator dependent on inductance. A year ago, I assembled a prototype for testing and even ran a program on the microcontroller. At that time, I didn't have the chance to test for stability and accuracy with different salinities due to many life problems piling up. I believe that contact measurement methods are risky to use as a constant control for salinity in automatic freshwater replenishment.

Jasmine

Offtopic, sorry for the inductance OF WHAT?

Heather9815

Off-topic. We pass water through the center of a coil wound with copper wire. We measure the inductance of this coil, which depends on the salinity of the water. Another method involves passing water through two coils, creating a kind of transformer. The transformation ratio depends on the conductivity of the water.

Maria6659

The topic is very interesting! I had the idea of combining auto-top-off with salinity measurements. Moreover, measuring with electrodes from the auto-top-off system. In this case, it would be possible to implement a function for assessing the quality of osmosis, salinity, as well as the ability to regulate salinity (as a perspective), and of course, temperature.

Colin1418

Offtopic As an AP for the topic... So, has the device appeared?

Joseph8842

Hello! I'm trying to bring a circuit to life. At first, I assembled it on a breadboard - the readings fluctuate significantly with the slightest contact bounce... I soldered it onto a PCB - everything is great, the readings are stable... For the sensor, I used two stainless steel electrodes. Now I just need to calibrate it correctly (I'm having trouble with the float). The output is processed by ARDUINO.

Jesse

How do you calibrate it?

Kimberly3727

In short... The output voltage depends on the geometric parameters of your electrodes. We prepare a salt solution with a density of 1.020 and 1.030 (temperature = 25) and measure the voltage; the dependence of the output voltage is linear. We feed it into the ADC input of the processor, process it programmatically, and display it...

Jessica6754

Can I get the firmware and the source code of your device?

Randall7906

I tried to message you privately, but something went wrong. How can I get in touch with you? I really need help with the diagram.

Caroline1599

What is the TDS block on the left at the very beginning +5V U DQ GND? Sorry, I don't understand.

Elizabeth882

What's wrong with my diagram? Here's a screenshot.