Hey! I just need some help with a project I'm working on, I'm pretty new to the engineering space but I already have some skill in programming. The stuff that's confusing to me is like Voltage, Amps, and stuff like that. I'm trying to power 5-6 28byj-48 stepper motors with an Arduino UNO, I have been told that they take 5V of power and I have also been told to not use the 5V on the Arduino because that would draw too much power and it would get fried. So I started looking for external power supplies online and I'm confused because I saw two different things when I looked up power supplies this, and this but the reason the last one confused me was that earlier i had found a module that would convert this type of power into pinouts...
I also have read on some other form posts that you need more voltage if you want to use more than one stepper motor?
One of those tiny steppers will be ok on the Arduino 5 volt pin if you are powering the Arduino with between 7 and 12 volts. But one stepper only. For 6 stepper you will need to power them all using a 3 amp 5 volt power supply.
Regarding the datasheet of the stepper you see that each coil has a resistance of 50Ohm. With 5V that means ( I=U/R) 0.1A per coil. Two coils may be engaged at the same time, which means 0.2A per motor. With 6 motors you have 1.2A. A 5V/2A power source will be fine.
Thank you for the detailed reply! Although the only power supplies with those specifications I found were the plug kinds and the converters I found reduced the amps to 500-700mA.... I'm still just a bit lost.