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« on: February 17, 2010, 06:22:19 PM »

I've seen a web pages dedicated to communicating with the Wii nunchuk using I2C.

The red, white, green, and yellow wires are used.
But my nunchuk also has a gray wire.  What is it for?

It is labeled DET on the circuit board.

I all the pictures I've seen online of the nunchuk opened up, I haven't seen one wit hthis gray wire.

I'm having trouble getting actually accelerometer data out of the nunchuk, so I' m especially wondering if I need to tie this DET wire to ground or 3.3v.  Maybe it is the cause of my problems.

Anyone want to make a guess?
Ion
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« Reply #1 on: February 18, 2010, 06:32:07 AM »

Technically, the nunchuk only needs 4 wires for operation. Power, ground, clock and data.

The fifth wire is connected to the plug so the Wii Remote knows that the Nunchuk, or other extension, is connected.

This DET wire ( possibly meaning detect ) , is connected from 3.3 V to Pin 3.


At both end of the Nunchuk extension cable, the 3.3 V pin is connected to Pin 3.

At the Wii Remote end of the cable, a loopback wire within the plug connects the 3.3 V pin to Pin 3.

At the Nunchuk end of the cable, the circuit board for the socket is soldered between the 3.3 V pin and Pin 3.

The so-called detection wire is terminated at both ends of the cable, and the signal is not carried through the cable.


It appears the Nunchuk must also need acknowledgement that it is connected to the Wii Remote.  Undecided


Some of this detailed information is described in the patent documents for the Wii Remote, which can be found on the net.


Thanks.
« Last Edit: February 18, 2010, 12:55:00 PM by zainey » Logged
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« Reply #2 on: February 18, 2010, 04:30:49 PM »

So in my case, where I'm trying to get my microcontroller to communicate to the nunchuk, do I need to do anything with the DET wire?
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« Reply #3 on: February 19, 2010, 04:35:32 AM »


Hi,

I had a closer look at a wired nunchuk and found the following:

1. At the plug, the 3.3V pin (Pin 1) is internally bridged with Pin 3, to provide an "attach" signal to the Wii Remote.

    There are only four wires going into the back of the 6 pin plug, and a separate wire for the shielding.


2. The grey/black wire from the Nunchuk circuit board is the earth shielding connection for the cable.

   The grey/black wire is wired internally to earth (to Pin 6).


I confirmed these connections using lead wires inserted into the spring slots located on the face of the plug, and a multimeter.

As for the DET marking, I found no such markings on or inside the Nunchuk.


Thanks.
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« Reply #4 on: February 19, 2010, 05:26:11 AM »

I guess there are different versions of the nunchuk.
Mine has 6 wires.

1 - red
2 - yellow
3 - gray
4 - not connected
5 - green
6 - white
shield - black

All wires are straight up to the circuit board.

Gray on the circuit board is clearly marked DET.

The board says:
FYD WIINUNCHUK 6.0

WII Nunchuk_E
20090918
V2.0

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