I have many Pi's at home, since we use them at work. I even have one attached to a TFT touchscreen. I worked with models A, B and 2. If you really want to go with a Raspberry Pi device, go with version 2. It's about the same price, but twice the power and usefulness of older models. Although you must know that there are many other pocket sized computers on the market worth looking at. (a few are on kickstarter) Here are a few examples. The best one so far, in my opinion: PINE[^] (15$) It has 32Bits and 64Bits versions, which other makers don't have. It's cheaper and faster than the Pi 2. Worth a look. LattePanda[^] (45£): If you'd like to experiment with Windows 10 IoT features, this is the one. Sub-10$ computers (less powerful, much smaller in size and price): C.H.I.P[^] (9$) Raspberry Pi Zero[^] (5$) Other stuff to look at maybe? > Arduino > Intel Galileo
"It's hard to beat someone who never quits".