1- I used Pololu motors 12V and effectively using the same series but 6V introduce more problems because high stall current. I think that put a limitation of 2A stall current is a good idea. Some students (not mine) playing Open soccer told me they have four motors of a well known German brand: every motor costs 300 euros! So a four wheels robot costs almost 1500 euros only motors (4+almost one as replacement, they told me). The problem here is that I see an apocalyptic growing of the cost of every single soccer robot. We have to try to keep the “price” low at least in the Entry category, IMO. This way a mentor can start the activities with students using a small budget and then the next year, for example, pass to LWL or Open if the students can deal or the budget grow. Any suggestion?
2- I want to form two teams, one Entry and one LWL: actually must I make two different playgrounds?
3- Manage a four wheels holonomic robot can be considered an ENTRY level? Or the Entry league is, by the moment, a sort of “a little bit less difficult” LWL (talking about the robot construction)?
4- Can we use a camera in the future Entry level? Use a camera is really “Entry”?
5- Hypothesis: this year we build a two wheels robot for Entry (possibly not expensive), next year the team change to LWL and a new team starts with Entry. After only two years I have a stable situation. I mean, depending on what mentors are planning it is not so indispensable reuse a 3 or 4 wheels configuration for Entry and LWL at the same time.
Thanks to everyone for the interesting discussion. Cheers.