https://forge.codesys.com/forge/talk/Engineering/thread/903b9740a0/2025-06-25T16:55:22.769000ZRecent posts to No Motion with SM3_RaspiStepper (GPIO 23/24 Show No Pulses)2025-06-25T16:55:22.769000Z2025-06-25T16:55:22.769000Zastutoskihttps://forge.codesys.com/u/astutoski/https://forge.codesys.comdec3f46579ea61cd47aa17a165cae9e63f3335f4

<div class="markdown_content"><p>Hi everyone,</p> <p>I’m completely new to CODESYS and have been teaching myself. And i Want to control an Axis using SM3RaspiStepper.<br/> Following the example on the RaspiStepper home page, I set up an axis through a POU and tied the SMC_StartupDrive (Visu) template to my axis instance (sud). Unfortunately, the motor never moves and I don’t see any pulses on the PULSE pin (GPIO 23).</p> <p>Hardware<br/> -Raspberry Pi 4 B<br/> -Nema 17 stepper motor<br/> -A4988 stepper driver (EN pin permanently tied to GND)</p> <p>Software / Runtime<br/> -CODESYS 3.5 SP21 Patch 1 – Raspberry Pi runtime (demo)<br/> -SoftMotion in demo mode<br/> -Package: SM3_RaspiStepper 0.0.0.6</p> <p>Axis parameters:<br/> Pulse pin GPIO 23<br/> Direction pin GPIO 24<br/> Enable pin 0 (unused)<br/> Disable pin 0 (unused)</p> <p>Whether I start the axis from the visualization template or through Online Config Mode, the motor never spins.<br/> In Online Config Mode I press Power → the state changes from Standstill to Discrete_Motion, but the motor shaft is still locked and no step pulses appear on GPIO 23 (checked with a scope).</p> <p>I can provide screenshots of the Visualization, PLC logs, or wiring pictures if that helps.<br/> Any ideas on what I might be missing?<br/> Happy to provide screenshots, project files, or scope captures if that helps.</p> <p>Thanks in advance!</p></div>