Does anyone have a data sheet for the Wii Classic Controller?

[VinnyViele]

Hello! I am making a device that connects to a Wii Nunchuck port that needs to emulate a Classic Controller. Does anyone know where the data sheet for the Classic controller is?

I need it so I know what to send down the I2C bus for the Nunchuck port to think that a controller is connected. From there, I need to be able to emulate button presses. Thanks!

[jm_araujo]

I've collected these bookmarks some time ago:
Arduino code for emulating wiimote extension:
https://forum.arduino.cc/t/success-arduino-as-wiimote-extension/21013/3

Documentation on the protocol:
http://wiibrew.org/wiki/Wiimote/Extension_Controllers

[bidrohini]

I just got this manual: https://www.nintendo.com/consumer/downloads/WiiOpMn_EN_setup.pdf