We received some of these cute little ARM based boards aimed at helping teach STEM to Year 7 children. They are really easy to use with a variety of coding environments and are great fun, but can do some pretty serious stuff too. The ring pin outputs are good for croc clips, banana plugs and conductive thread and you can access the other pins with an external edge connector. 

It has an accelerometer, a compass and BLE and the coding environment has a great simulator for testing your programmes before you upload. 

I will report back when I have done some more playing...