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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The Waveshare HRB8825 Stepper Motor HAT is a dual stepper driver module with two integrated DRV8825/HR8825 chips, supporting up to 1/32 microstepping. It provides 5V power (up to 3A) to the Raspberry Pi and allows adjustment of output current via a potentiometer.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL22311 WSAL22311 – HRB8825 Stepper Motor HAT For Raspberry Pi, Drives Two Stepper Motors, Up To 1/32 Microstepping]

== Technical overview ==
* Compatibility: Fits Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+. The module mounts directly on the RPi's GPIO header.
* Terminal blocks: Six available terminal block options for various stepper motor specifications (A1/A2/B1/B2 for M1; A3/A4/B3/B4 for M2).
* Microstepping: Six modes selectable via DIP switches: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step.
* Current setting: Maximum output current is 2.5 A. The current magnitude can be adjusted via the onboard potentiometer.
* Protection circuitry: Integrated short-circuit, overheat, under-voltage, and cross-conduction protection circuits detect fault conditions and quickly disconnect the H-bridge.
* Power supply: Input range 8.2–28 V; the onboard voltage regulator (MP1584) supplies up to 3 A at 5 V for the Raspberry Pi.
* Software microstepping: Requires soldering six resistors on the back; all DIP switches must be set to position 1 for software control to take effect.
* Hardware microstepping: S0–S2 control the M1 driver, S3–S5 control the M2 driver. By default all switches are at position 1 (slowest subdivision); set to 0 for testing.
* Pulse count without subdivision: 42 motors require 200 pulses per revolution (360° / 1.8°). 28BYJ-48 motors require 2048 pulses per revolution in single four-beat mode.
* Open-loop operation: The driver operates open-loop, meaning no feedback signal from the motor is fed back to the controller.

== Notes and version constraints ==
* Exact compatibility with Raspberry Pi 5 is not confirmed in the source text; provided demos refer to older Pi models.
* When using software microstepping, six resistors must be soldered on the back – this step requires manual soldering work.
* If the driver chip gets hot and the motor does not turn: check whether the motor current stays below 2.5 A; otherwise there is a risk of burning out. Increase the current via the potentiometer or use a higher-power supply if needed.
* The default position of all DIP switches (position 1) results in the slowest subdivision; set to position 0 for experiments.
* Official lgpio C-language guides for Raspberry Pi 5 are missing; only a Python3/gpiozero demo has been provided.
* The driver is open-loop – step loss may occur during load changes since there is no positional feedback.

== Source and revision record ==
* [https://www.waveshare.com/wiki/Stepper_Motor_HAT_(B) Stepper Motor HAT (B) - Waveshare Wiki]
* Source revision: 99951
* Captured: 2026-09-03T03:48:47+00:00
* SHA-256: <code>ccf28bd3b45ab590010909d41f1f8f880c68c351712974d9afcb60a25f8bef9d</code>

WSAL22311 – Stepper Motor HAT (B)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex