Originally designed for control of HVAC vanes and similar low-demand equipment, these stepper-motor gearboxes have lots of hacking potential. This is the lower torque / higher speed 16:1.
We had some of these drop on our desk a while back with a "You gotta find more of these!" message taped to it. What it turned out to be is a pretty cool, inexpensive geared stepper motor, ideal for a bunch of low-torque applications.
This 28BYJ-48 is a 5V unipolar geared stepper motor, manufacted by the boatload for the HVAC control industry, where you'll find these little units as actuators for airflow control in ducts and vanes. It features a 5mm "Double-D" shaft, mounting lugs, and nice 5-conductor 0.1" pitch connector. The gearing isn't the beefiest or most precise we've ever seen, but it's adequate for reasonable loads.
This version is the 16:1 reduction version (16.032:1, actually), so it's faster and less torquey than it's 64:1 brother.
Being a stepper motor, you'll need a motor driver circuit. There's many ways to drive a stepper, but this ULN2003 driver board is specifically designed to drive these 5V stepper gearmotors.
Thanks to Graham Wideman for his additional in-depth analysis on these gearmotors.
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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.