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I have a Galaxy S3 i9300 running ICS Cyanogenmod and I am trying to pair it with a Bluetooth device that has no PIN - a Wii Balance board.

The balance board does not have a PIN, however whenever I try to connect to it, my phone prompts for a password. I have tried the default 0000 and 1234 to no avail.

Is it possible to connect to a Bluetooth device without using a PIN?

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I don't think it'll work out of the box, you'll need an app that has the required code to work around the default Bluetooth protocol of requiring a PIN for devices to be paired securely.

There is an app called WiiScale which allows a user to link the Wii Balance Board with their Android device, provided they're rooted. The plus point of course is that it's compatible with CM which you're running. :-)

Alternate app: FitScales

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WiiScale is the app that I have, but it requires your device to be paired first. I can't pair the device because my phone is asking for the bluetooth password of the wii balance board. There is no password for the wii balance board. – rlsaj Oct 3 '12 at 1:10
@jaslr Looking at the app description in the Play Store it says "Bluetooth must be synced through the application, no passcode is needed" in the first paragraph. Below that, there's a list with the instructions for pairing the scale through the app. – fernio Jan 9 '13 at 1:04

Can you leave the code blank?

I can.

If not, the wii stuff controlling app can start a pairing without key from within.

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