I see on this link (Mega) https://store.arduino.cc/usa/mega-2560-r3
Maybe this is not ideal, but very helpful. So in each pin of that opens, i can connect a sensor? And as i understood adruino can power up from the usb cable or with a battery alternatively. Correct? And also, how i can get from a single usb, multiple readings? If you have in mind any related link from this forum or a guide will be very helpful!
And more... can i attach little dc motors to power up from adruino?