Use a completely unmodified wireless Wii Nunchuck as a control system for any Arduino based project. No added radio transmitter/receiver pairs etc.
This instructable does assume some experience with the Arduino microcontroller.
The radio receiver that comes with the wireless 'chuck is connected to an Arduino which then reads data from the 'chuck.
There are descriptions on the net of how to use an Arduino to "read" data from a standard wired Nunchuck. This is a handheld device which is meant to connect via a short cable to a socket in the base of a Wii controller (the rectangular thing), which then sends data via Bluetooth to the Wii (or indeed a PC).
A special adapter has been made by with six contacts on it to enable the experimenter to connect the plug on the end of a Nunchuck to the pins of an Arduino board.
Here is an example of one of these:
I am going to decribe a more robust connection however.
The software required to "read" a standard chuck (i.e. with a cable) will not work on a wireless chuck. The software for wired 'chucks can be found in several places on the net. The wireless 'chucks are not made by Nintendo and there are several makes out there - all from China.
The wireless chuck has a 3 axis accelerometer, 2 buttons and a proper proportional thumb operated joystick. The price is very low so this could be a great way to create a short range wireless control system for all sorts of Arduino based devices. This is why I am posting this instructable.
Here are two types of wireless chuck that I know will work with this hack. I haven't tried any others yet.