ULN2003 Stepper Motor

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mouka_f_slouka
Posts: 1
Joined: Fri Dec 20, 2019 7:58 pm

ULN2003 Stepper Motor

Postby mouka_f_slouka » Fri Dec 20, 2019 8:03 pm

Howdy all?

I have been trying to get a small stepper motor to work with the ULN2003 driver for a while now. I have seen a couple of YouTube videos showing these working together. However when I tried it myself, I could hear the clicking from the motor but it would not move. I have tried powering directly the motor with a 5V, 4A independent DC unit. It changed nothing. It seems like the ESP32 pins do not turn on the darlington pairs of the uln2003.
Anybody has any ideas as to what these guys have done to drive the stepper motor with this motor driver?
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martinayotte
Posts: 141
Joined: Fri Nov 13, 2015 4:27 pm

Re: ULN2003 Stepper Motor

Postby martinayotte » Tue Dec 24, 2019 2:37 pm

ULN2003 isn't the best for that purpose, especially that saturation requires input level greater than 2.7V.
You're better using MOSFET with low Vgs, such AO3401, where saturation could be achieve with only 1.3V.
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ESP_Sprite
Posts: 9709
Joined: Thu Nov 26, 2015 4:08 am

Re: ULN2003 Stepper Motor

Postby ESP_Sprite » Wed Dec 25, 2019 1:03 am

What motor and schematic are you using?
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