AC Current Sensor Featured Products It uses a micro-USB connector

It uses a micro-USB connector (same as most Android phones)

the current sensor then reads the two hall sensors deferentially

Spin Semiconductor's FV-1 product page

It comes with 8 effects in ROM and 8 on the re-programmable cartridge

USB to TTL Serial Adapter

AC Current Sensor Featured Products It uses a micro-USB connectorThe Modern Device AC current sensor is an absolutely unique, easy to use, electrically isolated current sensor for AC mains voltages (120 240 volts AC). Just zip tie the sensor to a power cord, and safely read the current proportional to the DC output. The sensor only has three connections 3. 3 or 5 volts, GND and the linear voltage output that goes directly into a microcontroller ADC (analog pin). With the sensor being entirely isolated from the AC