Has anyone found gears that fit the shaft? The ones shown in "frequntly bought together" are for smaller round shafts.

for anyone looking for this, 5mm shaft, its "flat" part fits a rectangle 3mmx5mm.

Could i use the driver to control a slightly bigger pm55l-048? i would probably need to push 19v through the uln2003.

Yes, you can use the driver to control pm55l-048, the maxmum voltage of ULN2003 can reach 24V.

what is it supposed to do?

It, or they, do nothing - - until you connect a smart source of drive signals. The included "driver boards" are electrical signal drivers to boost the strength of those signals. You might connect these boards between the motors and an Arduino or a Raspberry Pi or some manual speed control circuits for the stepper motors. The signals have to be the rippling sequence of logic pulses needed by the stepper motors. Because these motors have 64:1 gears, you program 64 sequences to get the shaft to go one full turn. Naturally, the gears trade off speed (RPM) for strength (torque) of turning. They also gain precision of output shaft position, which can be moved in STEPS, or fractions, of 1 sixty-fourth of a turn. If your only interest is in speed control, not positioning, you may want to look into DC motors (or gearmotors) and 'H-bridge drivers' and PWM (Pulse Width Modulation) controls.

Do you have instructions on how to set it up/test it with arduino? (newbe)

Google: "arduino 28BYJ-48 sample code" You will get plenty of examples to get you started. Good luck.

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ELEGOO 5 Sets 28BYJ-48 ULN2003 5V Stepper Motor with ULN2003 Driver Board

ELEGOO 5 Sets 28BYJ-48 ULN2003 5V Stepper Motor with ULN2003 Driver Board

Product ID: 81603210

Details

Brand
ELEGOO
Material
Metal Plastic
Model Name
EL-SM-003
Speed
9.38 rpm
Voltage
5 volts

🔆4-phase LED status indicators

🔌Plug & play ULN2003 driver board

⚙️64:1 gear ratio for max torque

$48.93

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your projects with precision & plug-and-play ease!

SEAMLESS INTEGRATION - Standard 5V ULN2003 driver board enables effortless plug-and-play with Arduino & Raspberry Pi.
BEGINNER FRIENDLY SETUP - No soldering required—just connect, code, and watch your projects come alive.
INSTANT VISUAL FEEDBACK - Built-in 4-phase LED indicators keep you in control with real-time motor status.
VALUE PACKED 5 SET BUNDLE - Get five motors plus driver boards and cables—perfect for scaling your innovative builds.
PRECISION TORQUE ENGINEERING - 64:1 gear ratio delivers smooth, powerful rotations ideal for robotics and 3D printing.

ELEGOO’s 5-pack 28BYJ-48 stepper motors with ULN2003 driver boards offer a high-torque 64:1 gear ratio and 4-phase LED indicators for precise control. Designed for seamless 5V operation, these plug-and-play motors are perfect for both beginners and pros working on robotics, 3D printers, and DIY electronics. Each set includes driver boards and cables, delivering exceptional value and easy integration with popular microcontrollers like Arduino and Raspberry Pi.

Specifications

ASIN	B01CP18J4A
Best Sellers Rank	#15,503 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in 3D Printer Interface & Driver Modules
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (828)
Global Trade Identification Number	06976021760015
Included Components	Female to Male Cable
Item Highlight	Compatible with Arduino, Suitable for Robotics, Automation and Motion-Control Projects, Standard Interface, Direct Docking
Item Weight	0.21 kg
Manufacturer	ELEGOO
Material Type	Metal, Plastic, Glass/Acrylic
Model	EL-SM-003
Model Name	EL-SM-003
Number of Items	5
Number of Packs	5
Part Number	EL-SM-003
Speed	9.38 rpm
UPC	746591610357
Unit Count	5 Count
Voltage	5 volts

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