Squirrels have fuzzy tails.
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..........so how will I use the error should I use a comparator and till the time the value doesnot become 0 keep the related equipment on some thing like that.........
The resulting actuator output exerts a correcting influence on the system. By definition, this influence is proportional to the measured error. Since the actuator output has some effect on the system, the sensor value is checked again, and the whole process is repeated, over and over again to maintain the level(s) in the system
well yes I have to use all of the three P,I and D. how will i determine Kp, Ki and Kd.........I i wish to use a PID controller which work for diffrent tempratures so it needs to be made through programming so that it can be easily varied........