A device is described comprising a microcontroller coupled to a transformer, wherein the transformer comprises a primary winding and a secondary winding, wherein the microcontroller is connected to a secondary circuit at a first location. The microcontroller is configured to provide a voltage at a first value to the primary winding for a period of time, wherein ceasing the delivery of the voltage induces a flow of current through the secondary winding and the secondary circuit, wherein the secondary circuit comprises at least one resistor and a resistive load, wherein the resistive load is variable. The microcontroller is configured to measure and/or compute voltage, time constant and peak current values with respect to the secondary circuit. The microcontroller is configured to monitor the intensity level at the resistive load using peak current and time constant values.
