DIY EC sensor

[Ranjib]

Yes, I believe both ADS1015 and ADS1115 are very reliable in this regard. They are much slower (~1kHz compared to 200-500 kHz for microcontrollers) but more accurate. The ADS1015 has 12 bits, e.g. about 1mV resolution in the largest range, and only about 1-2mV error, whereas the Pico has up to 8mV in certain places and the ESP32 has 140mV.

I have read that the ESP32‘s problem mainly arises in the full range, so if one uses a lower range and simply steps down the voltage oneself with a few resistors, this could become much better and can replace an ADS1015 for our purposes I guess.

That is awesome to know. i would always prefer an esp32 based solution , because it’s comparatively cheaper and simpler to build over ads115 . As long as it fits the reef keeping use cases, we are gold