OKAY, it's PIDE again!

Got a chance to work on it again today. Made it work by fixing a couple of issue, neither was about tuning: the level sensor is sensitive to the water pouring down from the top. Repositing the inlet hose to let water flow again the tank wall helped. Also fixed some grounding problem. Both regular and velocity PID seem to work now.

Note in the regular PID figure, the two traces are level and pump voltage. In the velocity PID figure, the two traces are the setpoint and the level, respectively.

Thanks all for your inputs.

Regular PID.png Velocity PID.png
 

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