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 + ULN2003 Driver Board for Arduino

Product ID: 255873310

Details

Brand
ELEGOO
Item weight
0.21 Kilograms
Manufacturer
ELEGOO
Model name
EL-SM-003
Voltage
5 Volts

🔌Plug-and-play ULN2003 driver board

🔴4-phase LED status indicators

⚙️64:1 gear ratio for precision torque

€ 50.06

Duties & taxes included

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Description

⚡ Unlock precision motion with plug-and-play power!

SEAMLESS INTEGRATION - Direct plug-and-play compatibility with ULN2003 driver board and popular microcontrollers like Arduino and Raspberry Pi.
BEGINNER FRIENDLY SETUP - No soldering or prior stepper knowledge required—just connect, code, and create your next innovation.
INTUITIVE STATUS FEEDBACK - Built-in 4-phase LED indicators let you monitor motor activity in real-time—debugging made effortless.
VALUE PACKED 5 SET BUNDLE - Five complete stepper motor + driver sets, plus cables and a surprise gift, all neatly organized for your workspace.
PRECISION TORQUE ENGINEERING - 64:1 gear ratio delivers smooth, high-torque rotation perfect for intricate Arduino projects.

ELEGOO’s 5-set 28BYJ-48 stepper motor kit includes 5V stepper motors with a robust 64:1 gear ratio and ULN2003 driver boards, designed for seamless Arduino integration. Featuring 4-phase LED indicators for real-time status, these motors offer precise, high-torque control ideal for both beginners and experienced makers. The plug-and-play design requires no soldering, making it perfect for rapid prototyping and educational projects.

Specifications

ASIN	B01CP18J4A
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (801)
Global Trade Identification Number	06976021760015
Included Components	Stepper Motor, Driver Board, Female to Male Cable
Item Weight	0.21 Kilograms
Manufacturer	ELEGOO
Model	EL-SM-003
Model Name	EL-SM-003
Part Number	EL-SM-003
UPC	746591610357
Voltage	5 Volts

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