Feather ULN2003 Stepper Wing

This is a simple board containing the ULN2003 stepper motor driver in a Feather form factor

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I have several projects that use stepper motors and wanted a simple Feather wing. While Adafruit already makes a Feather motor driver, I designed my own because I wanted to have some buttons and LEDs, as well as a TRRS input port. Costs ~$4 in parts, plus the PCB.

This Feather Wing was designed solely with through-hole components, which are easier to put together by hand for small runs.  In the future I may make a version with SMD components as well for professional manufacture.  I made this to control 5V 28BYJ-48 steppers that are easily available for ~$2-3 each.  Often they come with a ULN2003 driver board, if you are thrifty you can grab the ULN2003 chip off the board and move it to this board saving ~50 cents per board.  If you're SUPER thrifty you could also grab the LEDs, capacitor, and JST connector from that board. 

This board contains:

1) Two 3-pin headers (GND, PWR, and SIG).  These can be used to control a servo or additional sensor.

2) A 3.5mm TRRS port for external control

3) Two LEDs tied to digital pins

4) The ULN2003 motor driver 

5) Two small buttons for user control

6) Two holes to allow physical access to the Feather M4 Express reset button and visual access to the Neopixel on that board

sheet - 17.86 kB - 07/25/2020 at 20:07



Eagle SCH file for through-hole PCB

sch - 542.88 kB - 07/25/2020 at 20:05



Eagle BRD file for through-hole PCB

brd - 62.49 kB - 07/25/2020 at 20:05


  • M&M dispensing!

    Lex Kravitz07/25/2020 at 20:15 0 comments

    I am making an M&M dispenser for a friend, and used this board in it.  A Feather M4 Express was used for control (overpowered by why not??), and the motor was a 5V 28BYJ-48 I got on Amazon for $2.   Works great! 

    First draft, 07/26/20

    Second print, positioning the Feather and shield inside the dispenser, also shown with more M&Ms.

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Sophi Kravitz wrote 07/29/2020 at 17:53 point

Nice project. I think the feather ecosystem is fantastic, I use it for everything. 

Funny how the motors are the cheapest on Amazon!

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