I'm fairly new to arduino and I'm trying to get a stepper motor to turn according to a potentiometer. I have to use an external power source with 2 amps because my arduino only has one 5 volt plug, which i'm using for my potentiometer. according to an online calculator, i need a 55+ ohm resistor with .47+ watts. 75% of the resistors I saw on eBay were .25 watts, and according to some other threads 99% of arduino tasks don't need more than .25 watts, so i'm assuming a small stepper motor doesn't exceed this. I skimmed through a 400 page arduino guide, and it didn't mention resistor wattages once, so first off does it matter if i use a .25 watt resistor for a .5 watt task, and second off is my maths/online calculator right? Third off, the piece of code I'm using gave a note that my motor would draw 97 mA(i'm definitely using the same motor as they were talking about). http://www.numbatconspiracy.com/moodle/course/view.php?id=134 Press control + f then type stepper motors to find the task. Is it right saying that the motor will draw 92 mA?
I'd really appreciate some assistance with this, because I'm quite new to circuits. Thank you in advance!
I'd really appreciate some assistance with this, because I'm quite new to circuits. Thank you in advance!