I setup a second pi4 with robotank script and robotank ph board do to the instability of ph reading with ESP32. All when as normal did the ph probe calibration seamed to be fine. Now the ph reading doesn’t drop out it drops to a negative number like -3.5ph and then back to reading normal. I have read just about ever post with no luck fixing the problem. One thing that’s odd but I think @robsworld78 updated his script. Because when you run sudo nano boot/config.txt it opens and the line that in previous post are not there. Actually what is there is all commented out (#) in front of ever line.