http://stopstogo.com/dokuwiki/ 2026-04-04T15:46:58+00:00 http://stopstogo.com/dokuwiki/ http://stopstogo.com/dokuwiki/lib/tpl/dokuwiki/images/favicon.ico text/html 2021-02-13T07:43:05+00:00 Anonymous (anonymous@undisclosed.example.com) http://stopstogo.com/dokuwiki/doku.php?id=projects:a4sim:hardware:steppers:28byj48steppermotor&rev=1613202185&do=diff Stepper Motor - 28BYJ-48 28BYJ-48 Stepper Motor. Might be able to use it by rearranging the gearing. As it is, this unit has high torque, but maybe only 30 rpm - inadequate for the Altimeter hand. 3D Printing makes it possible to bracket and tap the motion from the gearing. By connecting to a 2nd gear (instead of 4th), it appears to be a 1:28 reduction, instead of 1:64. text/html 2021-02-13T22:35:25+00:00 Anonymous (anonymous@undisclosed.example.com) http://stopstogo.com/dokuwiki/doku.php?id=projects:a4sim:hardware:steppers:uln2003basedboard&rev=1613255725&do=diff ULN2003 Stepper Motor Driver Board 7-ch Darlington Sink Driver — .6A@50v peak The jumper is for on/off. The ULN2003 is one of the most common motor driver ICs that houses an array of 7 Darlington transistor pairs, each capable of driving loads up to