555 stepper motor driver9/16/2023 ![]() ![]() PALs were small arrays of logic gates with fusible interconnections, and your design is “burned” into the fuses much like a (EE)PROM. (MMI) and ABEL from Data I/O Corporation were basic Hardware Description Languages specifically designed for PALs, GALs, and CPLDs. CUPL and peers like PALASM from Monolithic Memories, Inc. WinCUPL is the modern version of CUPL (Compiler for Universal Programmable Logic) originally written by a company called Assisted Technology, now owned by Altium. Mature Readers will recall the “Happy PAL” Character Based on a clearly-explained logic table for driving the coils, a sneaky way to introduce Karnaugh maps, he proceeds to write the output equations in WinCUPL. Just when you’re expecting a small microcontroller to appear, the instead digs deep into his junk box and explains how to drive the motor with a 22V10 GAL (an electrically erasable PAL) and a 555 timer module. ![]() Next he demonstrates stepping the motor manually and then makes a simple FET driver circuit. He first goes over the fundamentals of a stepper motor in a practical, hands-on approach, and also shows us how to ring out the connections if the pinout is unknown. If you want a simple and easy introduction to stepper motors, check out the ’s short video where he designs a very basic stepper motor controller and packs in a lot of quick lessons along the way. ![]()
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