So I just wanna double check my work.
Right now, I'm building a robot, that will use 4 NEMA 17 motors (part number 17HS16-2004S), bluetooth module, maximum of two SG90 servo motors (most likely using one if designs doesn't work out), and RGB LEDs (total of 11 LEDs, each requiring 60mA per LED since it's a WS2812B).
The plan is to create a custom shield that will incorporate all the connections (drivers, motors, LED etc) along with a 5V regulator for the servos and LEDs.
I plan to use a 12V battery but I am unsure as to what mAh to use...So here's my attempt:
Each motor has 2A/phase, and since this is bipolar, that would be 4A per motor. Since there's four, that would be 16000mA total for steppers.
Each servo has a 700mA stall current, so multiply that by two to get 1400mA. Total mA with the LEDs (660mA) would be 18060mA. Now, I'm confused as to find the mAh (I know to multiply my total amps by hours I want it to run), since I don't know what's the normal runtime for something like this. 15min? 10min?
Also, which stepper driver would be the best for my case? drv8825 Is safest for me?
Edit: In terms of the drv8825 driver, since the continuous current/phase is 2.2a with heasink and the motor has 2A/phase, I would need to use the potentiometer to adjust the current to 1.1A if I wanted max current right? Seen in this video.