Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
4 pins: GND, Power, TX and RX. Flash "ASCII Test" to an Arduino and wire it up to the primary TX and RX port. Download BlueTerm for Android for an easy way to connect. It just works!
You can change the Name and PIN via AT commands.
Super-cheap and works fantastic
Can't be set for master mode - only slave. This means that you can't connect two of these devices together - you need to use a computer or phone with bluetooth
I'm working on writing an API for Android to enable easy 2-way variable sharing between Arduino and Android.
If you have any interest in connecting an Arduino to an Android device, pick one of these up. Also useful for a computer!
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