Output Plug

The Output Plug is a small board containing an 8-bit I/O expander plus NPN darlington array. Each pin can sink up to 500 mA @ 50V. By connecting the common clamping diode line to the supply voltage, relays and other small inductive loads can be used.

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.

For additional details, see


There is one solder jumper to configure each plug for one of the following 7-bit I2C addresses:


The even and odd I/O pins used to be mixed up in the following overview (below is now accurate).

Header Pinouts

Design Info

Dimensions: 21.1 x 36.8 mm
CadSoft EAGLE design files: see below.
This plug can be operated at 5V as well as 3.3V.

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.

How to Get It

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