Hysteresis is a control technique where two different thresholds are used - one for switching ON and one another for switching OFF. This prevents rapid toggling (chatter) when the input signal fluctuates around a single setpoint. Common use cases are: Temperature control (heaters, ovens) Pressure systems (compressors) Motor control with feedback signals Tank level control (pump start/stop) Why it’s needed? Analog signals often fluctuate slightly. Without hysteresis: A valu