I have another question regarding PID controllers. The main reason we are using PID controllers is for level rejuvenator controlling. We use three sensors, which are: an ultrasonic sensor to get the level of asphalt after milling, encoders to get the velocity of the machine, and a flow edge sensor to say the amount of rejuvenator that is being pumped out. The PID has a setpoint and the process variable is the amount of rejuvenator that is being processed the PID by using derivates, and integers try to fix errors and make the process value similar to the set point, and after that adjust the output in percentages to get the amount in percentage. The output is adjusted by opening and closing the switch that will control the valves to open and close multiple times to deliver the amount needed, right? Please, could you advise if I understood wrong?