Hi everyone,
I’m experimenting with the 28BYJ-48 stepper motor using the ULN2003 driver, and I’m hitting a wall. I can’t get it to actually move.
The driver’s LEDs flash in sequence, but the motor only twitches or hums instead of turning smoothly. Wiring, code, and power seem fine, but it doesn’t rotate as expected even though the step signals look right. This looks a lot like other reports where people get similar behavior, like constant vibration, weak torque, or complete stalling, especially when the motor is lightly loaded or improperly wired.
What I’ve tried so far:
Confirmed the wiring aligns with ULN2003 IN1–IN4 pinout. Tried sample Arduino stepping code. Powered via a stable 5 V supply, not just USB. Searched for half-step versus full-step mode issues, but no luck.
Has anyone successfully used the 28BYJ-48 with ULN2003 and resolved this? Could this be due to wrong stepping sequence (common tap mix-up)? Insufficient current or torque? Cheap gear reduction issues or poor wiring?
I’d appreciate any tips, code examples, or wiring check. Super grateful for your help!
Best,
Jordan
I’m experimenting with the 28BYJ-48 stepper motor using the ULN2003 driver, and I’m hitting a wall. I can’t get it to actually move.
The driver’s LEDs flash in sequence, but the motor only twitches or hums instead of turning smoothly. Wiring, code, and power seem fine, but it doesn’t rotate as expected even though the step signals look right. This looks a lot like other reports where people get similar behavior, like constant vibration, weak torque, or complete stalling, especially when the motor is lightly loaded or improperly wired.
What I’ve tried so far:
Confirmed the wiring aligns with ULN2003 IN1–IN4 pinout. Tried sample Arduino stepping code. Powered via a stable 5 V supply, not just USB. Searched for half-step versus full-step mode issues, but no luck.
Has anyone successfully used the 28BYJ-48 with ULN2003 and resolved this? Could this be due to wrong stepping sequence (common tap mix-up)? Insufficient current or torque? Cheap gear reduction issues or poor wiring?
I’d appreciate any tips, code examples, or wiring check. Super grateful for your help!
Best,
Jordan