ESP32 Stepper Driver Level Shifter Design
Thought for 5 sec
Use two 1×15 female header sockets on this PCB, then plug your 30-pin ESP32 DevKit into them like a removable module.
Assembly steps:
- Solder one 1×15 female header into each side of the ESP32 socket footprint J1.
- Keep both headers vertical and parallel while soldering. Easiest method: plug the headers onto the ESP32 DevKit first, insert the whole assembly into the PCB, then solder the headers to the PCB.
- After soldering, unplug/replug the ESP32 as needed.
- Match the ESP32 orientation to the board silkscreen and pin labels — especially VIN/5V, GND, GPIO 25/26/27/32/33/18/19/23.
Do not solder the ESP32 module directly unless you want it permanent. The intended build is socketed with female headers.
List the exact ESP32 GPIO connected to each of the 8 stepper buffer inputs — which GPIO drives PUL and DIR for Driver A, B, C, and D?
Thought for 6 sec
Exact GPIO-to-driver mapping in this design:
Table
| Driver | PUL / STEP input | DIR input |
|---|---|---|
| Driver A | GPIO 25 → PUL_A+ | GPIO 26 → DIR_A+ |
| Driver B | GPIO 27 → PUL_B+ | GPIO 32 → DIR_B+ |
| Driver C | GPIO 33 → PUL_C+ | GPIO 18 → DIR_C+ |
| Driver D | GPIO 19 → PUL_D+ | GPIO 23 → DIR_D+ |
Each ESP32 GPIO drives an SN74AHCT125N buffer input first, then the buffer output goes to the corresponding driver terminal.
Review mapping and export
Verify terminal labels
Create wiring guide
Rerun final checks
Export latest Gerbers
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