DIY Wii Adapter for interfacing with Nunchuck or Wii Motion Plus

Wii Motion Plus and Nunchuck are awesome for DIY projects - 3 gyros, 3 accelerometers, and x-y joystick. Although they use I2C interface, Ninntendo has a non-standard connector - so you are either faced with cutting wires on a controller or making your own adapter.
    It's easy to make a Wii DIY adapter, if we know connector pinout - It's same for Nunchuck, Wii Motion Plus, or any Wii controller:
  • Pin 1 - Power
  • Pin 2 - Clock
  • Pin 3 - Not used
  • Pin 4 - Not used
  • Pin 5 - Data
  • Pin 6 - Ground
Pinout for Nunchuck Wii Motion Plus connector I made a connector from two piecesof one sided copper-clad boards which I glued together ( super glue is fine) forming a board that is about 2mm thick with "independent" coper layers on both sides. Then, cut-out a plate that is 6.7mm wide and around 18mm long. On one side, trace two lines which are 1.7mm from the long side. Scratch-out copper layer in between those lines. What you are left with are two copper tracks 1.7mm wide with 3.3mm empty space in-between. I used "x-acto knife" to scratch copper, rather then chemicals available to make home made PCB boards. The other side of the connector should look like as shown in the pictures. Main objective is to have enough space to solder wire leads and not have any connections (shorts) between four connector stripes. Schematic-Wii-connector Solder four wire leads, taking care that there aren't any shorts. I also used shrink tubing on every lead as well as on the whole cable - see pictures. On the other end of the cable you can either solder header pins, or any other connector that suits you. Wii addapter - side one One sine of connector Wii adapter - side two Other side of connector Wii adapter - leads soldered Wire leads soldered Wii adapter - leads soldered 2 On the other end of the cable you can either solder header pins, or any other connetor that suits you. Wii adapter - finished