• on Computer/Software/Internet
  • Published in issue 9/2012 on page 18
About the article

Nunchuk USB interface

repurposing a video game controller

Nunchuk USB interface

The famous Wii games console from Japanese multinational Nintendo uses a Bluetooth wireless controller called a Wiimote. This can be connected by cable to another control unit called Nunchuk, which enables the player to use both hands in a video game, Wiimote in one hand and Nunchuk in the other.

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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update

Nunchuk interface characteristics
• controller connected directly to the main PCB
• I²C protocol
• allows reading of the digital data from accelerometer (10 bits), analogue joystick (8 bits), and buttons (active Low)
• USB connector for interface with PC
• PIC programming with a bootloader and PDFSUSB software
• application programming using Flowcode
• DB9 sockets compatible with E-blocks modules
• 4-pin expansion port for a future serial link

Resistors
R1,R2 = 10kOhm
R3,R4 = 22Ohm
R5–R9 = 1kOhm

Capacitors
C1 = 470nF
C2 = 10µF 16V radial
C3 = 100nF
C4 = 220nF
C5 = 2.2µF 16V radial
C6,C7 = 22pF

Semiconductors
D1–D5 = LED, 3mm, low current
IC1 = PIC18F2550-I/P, DIP, 28-pin, programmed, Elektor # 100594-41
IC2 = LP2950ACZ-3.3

Miscellaneous
S1, S2 = pushbutton
K2 = USB-B connector, PCB mount
K3 = 4-pin pinheader
K4, K5 = 9-way sub-D socket, right-angled pins, PCB mount
X1 = 20MHz quartz crystal
PCB # 100594-1
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