Micro Controller Based Automatic Controller regulates the output, monitors spark and arc conditions, back corona etc and optimizes the input electric power to ESP using charge ratio control. The Automatic Controller has several control and diagnostic features applicable for ESP environments. The Automatic Controller continuously monitors the `Spark` and `Arc` conditions in the precipitator and controls the Power delivered into the ESP in order to optimize ESP operation. Micro Controller Based Automatic Controller is designed with 4 line X 20 character Digital LCD Backlit Display for good visibility.