When we originally designed M2, we added a XBee®-compatible socket to the processor board to give you as many add-on options as possible. This has worked well for many projects, but it turns out many of you are just looking for a cheap way to add Bluetooth and WIFI.

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Most newer cars already have a display showing you how efficiently you are driving. Usually this takes the form of a digital readout showing you miles driven per gallon of gas over 2 time-frames: short term (instantaneous) and long term (average). Wouldn't it be cool to add this feature to older cars?