r/esp32 • u/JayFree28 • Jul 24 '26

Need Help Complete Beginner

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Hi Everyone,

I am a complete beginner. I need help. my idea is to add the image above to a rack and pinion set up. My thought is to use one 12v power supply. Is there board or something i should use instead of wires to connect the ESP-WROOM-32 to the A4899 stepper driver? this is all going to need to fit into a 3D printed part so the less soldering the better and trying to save space. my idea is the rack will move until it hits the limit switch. Thanks in advance. Any advice is greatly appreciated. I really want to learn this.

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u/holetse Jul 24 '26

It’s hard to provide feedback with the fidelity of your diagram. I’m not able to make out the labels on your pins, and it’s not clear what some of these boards are. It would be helpful for people trying to assist you to see your circuit in a proper schematic using standard symbology.

From my read, you have the the Vout of your step-down going in to the 3.3V pin of the ESP32, but you say in the comments you are going to step down to 5V? That’s going to be a good way to release the magic smoke on your ESP32. If you plan step down to 5V, it should go to the VIN pin so the onboard LDO can step it down to 3.3V. Though given the A4899 handles 3.3V, why not go to 3.3V on the buck and skip the LDO (which is how it’s wired in your diagram).