Thanks Moz for your reply!
I actually started with a BLE device. I used a TinyDuino + BLE shield. It works.
So I didn't switch because to the Imp because the BLE solution is more difficult.
The thing I really like about the Imp setup is the simplicity. I switched because the Imp is easier. If it is easier for me it will be easier for most people. The hub should be understandable and affordable (Imp costs only $29) for as many people as possible.
The main advantage I think is you can use any device with an internet connection and control your model instantly. The user interface can be extremely easy (really basic html, even only a url will do) or more complex (processing.js, etc.). You can use iPad's or iPhone's Gyros at the same time you use the keyboard of your PC. There are tons of usable codes out there.
Another fun thing is you can control for instance 4 Lego Crawlers with 4 friends using only one hub. Or control a dirt truck and a crane with 1 hub. You control the truck with your iPad and have your PC calculate some recorded movements for the crane. Endless possibilities.
I'll try to show it on a Youtube movie.
I realize now that there is one major thing I have to add to the CONS. You always need a internet connection. Outdoor situations are becomming more complex. I managed to do this by creating a wifi hotspot on my phone.
Moz thanks again for your comment! It helps me. Maybe I have to take a look at my TinyDuino again
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Jeroen