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We have a Wii balance board pressure sensor and were wondering how we could connect this sensor to an Arduino board.

On the circuit board (see picture) of the Wii Balance Board are Japanese characters printed, only those are pointing out which color there must be. The problem is, most pressure sensor examples of the Arduino are with 2 cables, but the Wii pressure sensor got 4 cables. So which cable is for what?

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  • \$\begingroup\$ I think a Wii balance board has four sensors- one in each corner of the board. I think the board is battery powered and communicates via Bluetooth. en.wikipedia.org/wiki/Wii_Balance_Board I'm not sure you have what you need there. \$\endgroup\$ – mikeY Sep 30 '13 at 15:41
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    \$\begingroup\$ Hi Mikey, thanks for you answer. Yes we already now that it has 4 sensors, but they have 4 cables attached to their part. Problem is we have no clue which role the red/blue/white/green cables got and how we can connect this sensor to an arduino board. \$\endgroup\$ – Carlo Matulessy Sep 30 '13 at 16:30
  • \$\begingroup\$ If the thing in the third picture is one of the sensors, it probably has power, ground, and two communication lines. See if this is helpful: freepatentsonline.com/20090093305.pdf Especially 0100 and 0108 on page 7. \$\endgroup\$ – mikeY Sep 30 '13 at 19:17
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    \$\begingroup\$ For anyone coming to this question "MLC714N load cell" is the strain gauge name to google \$\endgroup\$ – Blundell Sep 12 '17 at 20:34
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    \$\begingroup\$ Yeah I had to read around, but I get it now, these are the 4 wires out of the wheatstone, not 4 wires you would attempt to input into a wheatstone \$\endgroup\$ – Blundell Sep 13 '17 at 19:23
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It has two TI ADS1222 2 channel Serial ADC converters, for four sensors total.

The two smaller ics labeled TI 93 DBA3/DBAQ are probably opamps (can't find the part) but they should trace out to the ADC converters. Most likely, LMV932s, dual low voltage high quality opamps, but they don't match the suggested topcodes.

The four pin connections are Strain gauge wheatstone bridge connections.

The topmost (White) connection for each of the four bridge connections is the ground; relative to this, the two middle connections should be at 1.2 VDC, and the bottom should be at 2.7 VDC

The entire board acts like a standard wii remote, with a standard i2c wii balance board extension/accessory. It can be accessed via Bluetooth, or you could maybe tap into the i2c lines as well.

See http://wiibrew.org/wiki/Wii_Balance_Board for the bluetooth/hid descriptions and information.

Frankly, the bluetooth way is the easiest. Unfortunately, it's not as easy as the Wii Nunchuck being a simple i2c device with a connector.

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  • \$\begingroup\$ Note that connecting via Bluetooth requires a L2CAP module. \$\endgroup\$ – emc Apr 6 '15 at 0:55
  • \$\begingroup\$ My board has the smaller IC's labelled as TI 81 ODBQ Looks like these are ti / Burr Brown OP2333 CMOS Op Amps. \$\endgroup\$ – Peter Tyacke Sep 28 '19 at 20:59

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