The open source hardware prototyping platform Arduino has been described in comprehensive ways. So the question boils down to which Arduino platform to use, and are there any clones around, offering something special?
Besides the fact, the platform should be supported by the programming environment concerning the envisaged project, my son has raised one major requirement: A robot controlled by cable is so uncool...
As Scratch based programming controls the Arduino from a computer (PC / laptop), a permanent link is mandatory. Looking for a permanent connection to embeded systems you come across the XBee standard implementing IEEE 802.4.15 protocol. This seems to work, but presents a rather high priced solution - especially as some of the standard's core features are not mandatory to this project. But how about using the well established Bluetooth standard?
In fact - if you dig deeper - there are Arduino shields around promising this kind of functionality. And - even better - there is at least one Arduino clone implementing wireless programming via Bluetooth: ITead Studio's Iteaduino BT.
In addition Iteaduino series boards come with extra electronic brick interface compatible connectors which allow direct connection of servos to the board as well as sensors with 3 pin jumper wires.
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