Monday, February 15, 2010

WM+ update long overdue

Well I havent posted here for a while, but I do have many updates for a couple different projects. I never ended up getting full kalman filtering to work between the wm+, nunchuck, and arduino, but there have been a few other, maybe better things. First, my transistor method is no longer needed to interface the wm+ and the nunchuck at the same time. Pass thru mode has been discovered and is described (krulkip) in this post: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1248889032/45 . Second, the kalman method has been mostly abandoned on the arduino platform, and in its place two options have surfaced.
1. Complimentary filtering as seen here .
2. Direction Cosine Matrix. Not implemented with wii peripherals but easily enough ported. Tons of information over at diydrones.com . Much less computationally intense and more suited to a microcontroller like the arduino.

Good luck on all your projects!

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  2. Hi,

    I'm working on an application that integrates the gyro with an electronic compass for my FYP. I'm using the WiiM+ as the gyro. The problem is that my electronic compass sends separate data to my PC, and the Wiimote also sends data to my PC, simultaneously. However, both are through radio (wifi/bluetooth) and they could have different errors.So, to 'synchronize' both sensors, I use timestamps. My electronic compass timestamps the data inside itself and sends a file to the PC. But the Wiimote sends its values one by one, and it is timestamped only after it is received. So, there's a random delay here that can't be accounted for.

    I was wondering, is there a way I could synchronize the Wiimote's clock to my compass's/PC's clock? I saw from your blogpost that you'd allocated pin 4 for the clock of the Motionplus and I was wondering if you actually managed to manipulate it, or atleast read out its value.

    Any help/ideas would be much appreciated. Basically, I just need to sync these two devices, so I can take both sensor values for a particular instant of time.

    Thanks!

    priya90@gmail.com

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  6. Ok so I, after much research, have been able to read the gyro data of the new wii motion plus peripheral with the arduino microcontroller.

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  7. But the Wiimote sends its values one by one, and it is timestamped only after it is received. So, there's a random delay here that can't be accounted for.

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