I have connected 3 different official nunchucks to my raspberry the following way; pin 1: 3.3v, pin 3: SDA, pin 5: SLC, pin 6: GND

I tried several power supplies including a 230 watt pc psu but every time my raspberry wont boot or shutsdown after connecting a nunchuck.

Any ideas on what the problem could be?

  • 1
    Power the nunchucks separately from the power supply and only connect SDA/SLC pins. Use the same power supply for both Pi and nunchuks to ensure the common GND though- use the big one you got. – Piotr Kula Nov 5 '13 at 16:37
  • I tried this, did not work. When I measure the current before connecting its 5.1V and after it drops to 2.8V. – thommie Nov 5 '13 at 18:50
  • Where are you measuring the current? Can you post a photo of all the connections. – Piotr Kula Nov 5 '13 at 19:04
  • connected it like this, circles is where I measured. i40.tinypic.com/2hfrzts.png I hope its clear enough – thommie Nov 5 '13 at 19:29
  • Do you still have the VCC connected to the power supply AND nunchucks? You are connecting to the GPIO pins right? – Piotr Kula Nov 5 '13 at 19:49

So I just went and searched for Wii Nunchuck pinout and it seems like your PINS are not connected as in your diagram. It is possible that you numbered your pins in another order but you should cross check.


enter image description here

What the guy explains is that you can connect +3.3v to PIN 2 or 3 it does not matter because internally they are connected. This is a sensing PIN for the Wii. Pin 1 is SDA and PIN4 SCL

Another thing is that the Pi runs at 5Volts and this WiiChuck at 3.3Volts. (But I think some other ones run at 5Volt - I saw some a few with 5V markings)

Any way even if you are powering the Pi on the GPIO 5v pin and then the Nunchuck on the GPIO 3v3 you might have a power limitation problem on the 3v3 rail. A computer PSU will have 3v3 on the Orange cable and 5v0 on the Red cable. Keep yellow 12v0 away form the Pi. Connect the GND direct to the PSU as GND over current can also cause issues.

Double check you do not have a short somewhere or that the pins are mixed up.

enter image description here

| improve this answer | |
  • Sorry I forgot to mention I'm using an adapter like this one seeedstudio.com/depot/grove-nunchuck-p-1474.html – thommie Nov 5 '13 at 21:47
  • ONe thing that is got me consufused is that it says 5volts but the Wii nunchuck pinout shows 3v3? Are there various versions. Sorry I never owned one of these. – Piotr Kula Nov 5 '13 at 21:50
  • Wii nunchuck suppose to be connected to 3v3 busses but it is possible to run them on 5v. I tried your way, the raspberry does not shutdown but the nunchuck isn't detected either... – thommie Nov 5 '13 at 22:21
  • They do actually work on a Wii, right? :) – Piotr Kula Nov 6 '13 at 8:44
  • Yes of course! Tried it again to be sure. – thommie Nov 6 '13 at 10:32

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