Gravity: Analog AC Current Sensors DFRobot Gravity: Analog AC Current Sensors eliminate the need to cut wires or reconnect circuits in order to measure the AC current. These sensors read the AC current value by clamping the AC transformer probe on the AC line and plugging 3.5mm headphone jack into the signal conversion-module. The analog output is designed to be compatible with a 3.3V/5V microcontroller. These AC current sensors are conveniently used for AC current measurement to monitor AC motors, lighting equipment, and air compressors.