Here’s a turbidity sensor driver circuit based on LM393 for the intended task. Tweak it! On the Other Side. While I was experimenting with my old TSD-10 turbidity sensor lifted from a defunct washing ...

Coming to the working principle of the circuit, as the output voltage of the turbidity sensor, appears across the2.2KΩ load resistor(R2), is slightly above the set point, the green indicator (LED1) ...