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LEGO models my own creation MOCpages toys shop "NXT-Nunchuk" a New Mindstorms NXT Sensor!Robotics
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"NXT-Nunchuk" a New Mindstorms NXT Sensor!
About this creation

The Wii Nunchuk is designed to work together with the Wii Remote on the Wii console. Contoured to fit perfectly in your hand, the Nunchuk adds extra buttons, an analog joystick, and additional motion-sensing control to expand the game play possibilities.

And it Uses the I2C 2-Wire Data Protocol ................

Bill of Materials Required:

  • 1x Nunchuk
  • 1x NXT Compatible Male Plug
  • 2x resistors 33k
  • 1x diode 1N4148

  • Lets Begin the Construction Process:

    Open the Nunchuk case with a small screw-driver (1,5mm) as shown in the Video.

    You should now have the Wii Nunchuk's Circuit Board as pictured above.

    Now de-solder the 1,8k pull-up-resistors R1 and R2. No fear of SMD. SMDs sticks to the soldering iron!

    Circuit Diagram

    Now solder the new pullup resistors. The Lego reference design suggests 82kohm pullup resistors for i2c. I found out, that 33kohm is the best value for stable connection. I changed the SMD resistors, but if you have no SMS resistors use common 1/4W size and solder the resistors on the connection cables. Additionally I mounted a drop-voltage-diode to reduce the voltage of the nunchuk.

    Now cut the original Nunchuk cable connector of and strip the white insulation back by about 10mm to expose the conductors. Carefully spread them out in the correct order matching the circuit diagram order. Now using an original Lego Mindstorms NXT Black Connector Cable as a reference, slide the ordered coloured wires into the NXT Compatible Male Plug.

    Carefully place the NXT Compatible Male Plug on a solid surface and take a small "Blade" Screw Driver and individually push the 6 Brass pins in the plug home. Next test that the new plug fits easily into the NXT's Sensor Sockets.

    To finish the plug and make it secure. Get some 5 Minute Araldite and fill the back of the plug where the cable enters. Leave to dry for an hour, before carefully reassembling your Wii Nunchuk

    Video of My NXT-Nunchuk Controlled Zammor Bot in Action!

    Visit the Forums at for Code to start using your new NXT-Nunchuck Sensor...............

    For more details, please fly too my website:


     I made it 
      April 20, 2011
    Quoting eathuis 305 Wow this is brilliant!,buy the way you have been added to my favourite builders!!!
    Thanx! I tend to update my MOCpages no as often as I should.Check my Blog, for more regular project updates.
    Sparra McNamara
     I like it 
    eathuis 305
      April 19, 2011
    Wow this is brilliant!,buy the way you have been added to my favourite builders!!!
     I like it 
      April 19, 2011
    WOW! That's brilliant! Great stuff right here! :D
    Sparra McNamara
     I like it 
    Cheesy Q
      April 18, 2011
    That is INSANE! that would make a cool set.
     I like it 
      April 18, 2011
    By Sparra McNamara
    Add to my favorite builders

    people like this. See who.

    4,361 visitors
    Added July 1, 2010

    LEGO models my own creation MOCpages toys shop "NXT-Nunchuk" a New Mindstorms NXT Sensor!Robotics

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