The Analog Plug is an 4-channel 12- to 18-bit ADC connected via I2C. It’s based on the MCP3424 chip.

There is a 2x6-pin female header on the side, with the 4 differential analog inputs as well as GND, +3V, PWR, and IRQ. The Breadboard Connector can be used to hook up to the first 3 analog channels, GND, and +3V.

An I2C bus running at 3.3V is used for I/O, with all the power and signal lines brought out to to both sides of the board to allow daisy-chaining with other I2C-conformant boards.

This board uses the conventions of a JeePlug and can be used with the ports on a JeeNode. It can also be used with other boards and MCU's, if you hook it up properly and adapt the interface code for it.