Patrick van der Poel wrote to me with some pictures of what he found when he opened up a Wiimote recently.

Instead of the normal Pixart sensor he found a strange daughter-board configuration. It looks very easy to remove, but it’s nothing like the regular sensor.

Fortunately they labelled the board pinouts on the underside of the host so it was easy to work out where the correct pins were. Patrick tells me that the Wiimote came from the Japanese market.

Anyone know anything about this configuration?