Hello, I am about halfway through making my arduino powered vending machine and i am starting to worry about frying my board as I intend to use four stepper motors (could be switched for DC motors), four ultrasonic sensors, four pushbuttons and an LCD. I plan to connect the LCD using a shift register due to lack of pins and want to connect the motors using shift registers as well.
I am using 28-BYJ48 as my steppers and an Arduno Uno.
I am assuming using the 5V on the arduino board will not cut it and will have to use some sort of external source.
I am considering using a 9V wall adaptor from amazon to power the board as opposed to the 5V on the arduino but I am not sure if that is enough either.
Another option I am considering is to take a 9V battery and connect it to the four motors independently using a battery snap so that i can power the motors using the battery and the rest using the 5V from the arduino.
The motors will only be running one at a time. I was wondering if using DC motors as opposed to steppers will work better in this situation as accuracy is irrelevant and we simply want the motors to turn off and on in one direction.