Other extension Controllers are mapped at register address 0xa40000. Wii Motion Plus is mapped at register 0xa60000. Remember to set bit 2 (0x04) on the first byte of the Output Reports to write to registers! It is easy to make homebrew peripherals see the Tenkey numberpad project(japanese), gyro project(japanese), the Twiidler project, the DIY Wii drum controller, the OpenChord Guitar,or the DIY Wii guitar proof of concept demo video. Peripheral Protocol is 400kHz "fast" I2C, with slave address 0x52. The Wii Motion Plus is a small expansion which itself has an expansion port, allowing people to plug the Nunchuk into the Wii Motion Plus and the Wii Motion Plus into the Wii Remote. There are also many third party versions of classic controllers and nunchuks. The balance board acts like a dummy Wiimote with its own type of extension controller. In addition, Guitar Hero guitars and drums also act as extension controllers, although the Rock Band guitars and drums connect using their own system. Nintendo has currently released two extensions, the Nunchuk and the Classic Controller.
Communications are encrypted, as detailed in below. Communications are bidirectional synchronous serial I2C, and the devices provide a virtual register block of length 0x100 that is mapped at 0xa40000 in the Wii Remote's address space (The 7-bit I2C address is 0x52). The Wii Remote includes a 6-pin expansion port that allows external peripherals to be connected to it. Pins on the Wii expansion controller cable
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