I have two small motors from an old broken helicopter and I need some help for connecting them to my arduino duemilanove board. You can find some pictures attached.
From what I’ve read, for bigger motors, the recommended way to use them is by using a transistor and an external battery but in my case both helicopter motors were powered by a 3.7V battery and I think they are small enough to be powered directly by arduino board.
I would like to know if I can safely connect them to the arduino board or should I use the following approach: Motor Speed Controller - Arduino~Soapy29
Also, these motors don’t have serials or identification numbers and I cant find any specifications for them. Do you know a way to find more details about them?