<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body >Jeff beat me to it. The best way to test would be to measure the resistance between the leads. What to look for depends on your particular motor though. <br><br><div>-------- Original message --------</div><div>From: Jeff Highsmith <jeff@jeffhighsmith.com> </div><div>Date:01/20/2015 1:41 PM (GMT-05:00) </div><div>To: Grawburg <grawburg@myglnc.com> </div><div>Cc: Triangle Embedded Devices <TriEmbed@triembed.org> </div><div>Subject: Re: [TriEmbed] Stepper Motor </div><div><br></div>Brian,<br><br>Looking at the picture, I see the shaft is offset, meaning this is most likely a geared motor. Not all gear sets are "back-driveable", so the resistance to hand-turning may not be an indicator of the motor's condition. <br><br>Jeff :)<br><br><br>> On Jan 20, 2015, at 13:07, Grawburg <grawburg@myglnc.com> wrote:<br>> <br>> I have two 28BYJ48 5VDC stepper motors that I think are kaput. They are difficult to spin (unpowered) which I presume is not good. I expected them to turn freely much like a simple motor. When I try to run them from my Pi (I have the controller and code) I can feel them trying to move. Ready for the trash can?<br>> <br>> <br>> Brian Grawburg<br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> _______________________________________________<br>> Triangle, NC Embedded Computing mailing list<br>> TriEmbed@triembed.org<br>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br>> TriEmbed web site: http://TriEmbed.org<br><br>_______________________________________________<br>Triangle, NC Embedded Computing mailing list<br>TriEmbed@triembed.org<br>http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br>TriEmbed web site: http://TriEmbed.org<br></body>