Hey guys, so i’ve built a pH adjuster for nutrient solutions which only consists of a wemos microcontroller, a relais, the pump for putting pH + or - into the solution, the pH Kit E-201C-Blue and a lcd display. After calibrating the sensor, everything works fine for like an hour but afterwards the pH shifts so much, that the whole project can’t do the job at all. After like 3 hours the pH is about 1 lower than it was at the start and i just can’t figure why. Is the pH Sensor not designed for permanent measurement or am i doing something wrong here?
