Hi all, Week ago I posted a question that was a related to my other 4 year old post. I guess a moderator moved my new question to the old post. Now I see counts of replies on my name and --> pert moved on the post, I go to the end of the old post but don't see any replies. I'm lost !

Please post a link to the topic that you are referring to

Here is the topic: [image] Creating The BMW Sculpture General Guidance Hi all, I need to control 30 stepper motors (28BYJ-48) - (5V) . Each motor has to be controlled individually. How do I do this ? With a port expander ? Could someone pls tell me which port expander is needed to use with Mega. Thanks. [image] ba47: I go to the end of the old post but don't see any replies. Look again. You did indeed receive a new reply: [image] Creating The BMW Sculpture General Guidance I think the difference in cost between DC motor and stepper is marginal, when you add in the driver. Additionally if using an encoder, that requires more CPU. I think unless you are in the business of making 1000's and could afford to design (or order) a custom IC, steppers are probably still better for this application. Also, I would not limit the design to 8-bit AVR, many 32 bits are faster and cheaper, although of course one has to leave the warm environment of the AVR ecosystem.

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pert January 27, 2025, 9:50am 3

Here is the topic:

Look again. You did indeed receive a new reply:

Topic		Replies	Views
Creating The BMW Sculpture General Guidance	319	7580	February 5, 2025
Controlling 32 or more stepper motors Motors, Mechanics, Power and CNC	108	2424	November 6, 2024
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Trying to replace DC-motors with stepper motors in existing code Programming	16	854	November 13, 2023
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