Isolating stepper motor from controller with one power source

Using Arduino Project Guidance
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Is this set up good enough to protect my microcontroller from the stepper motor…? I only recently received my first (cheap) stepper motors and know they should not be powered off the microcontroller.

I'm using:

  • ULN2003 28BYJ-48 4-Phase Stepper Motor with 5V Drive Board
  • 5V 3A 15W AC 100V~240V to DC Power Supply Adapter
  • Adafruit HUZZAH32 – ESP32 Feather Board

(I'm also driving a small tft screen and sonar sensor with the esp32) Everything works fine when I use a separate 5 volt power supply and my stepper motor uses ~.3 amps at 5 volts.

I'm curious if this setup is appropriate to protect my controller? If it is not, any suggestions would be greatly appreciated

Thanks!

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The ESP 3.3V outputs should be able to control the motor safely.

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3

really, that's great! So I should be able to plug in the ULN2003 positive to the USB power pin (5 volts) from the esp32?

4
  • Connect the external 5V supply directly to the motor driver power pin.
  • Connect the external 5V supply to the ESP USB connector.
1 Like
5

thank you!