IntroductionAll Wii Remote attachments contain a device called an I2C (Inter-Integrated Circuit), a system developed by Philips that is used to attach low-speed peripherals to electronic devices. While usually the electronic device is a Wii Remote; in this case, it will be a LEGO MINDSTORMS NXT.
However, the NXT uses a slight variation of the I2C system, the following issues exists when trying to get the NXT to work with a Wii attachment:
- Wii attachment uses 3.3V while NXT uses 5V.
- Most Wii attachments have resistors that do not match NXT requirements.
The current way to resolve this issue is to remove the resistors and drop the voltage of the NXT to 3.3V; however, this method is destructive and the attachments will never work with the Wii Remote again, also this requires that every attachment be modified for the NXT to use them.
This is where this project comes in, by creating an adapter to solve these issues.
Current DevelopmentDevelopment of the NS-NXWii is going along smoothly and we are expecting an Alpha-level prototype to be finished soon.Our current testing apparatus works great, our two current attachments that we are working with is the Wii Nunchuk and the Wii MotionPlus. The MotionPlus is completely working with the adapter however we are having issues with the Nunchuk. We believe that since the Nunchuk only connects a few times during testing that a voltage/current stabilizer is needed, we are attempting the rectify this issue with a capacitor on each side of the voltage converter which is used to drop the power supply from 5V to 3.3V. Once these two attachments work we will begin testing on other attachments such as the Classic Controller and Guitar.
The Alpha-level prototype testing will begin once the first two attachments work with the sensor. If anyone has any insight into how to overcome any problem mentioned, please feel free to contact us.