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WSAL15669 – Stepper Motor HAT/en

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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 Stepper Motor HAT is a Raspberry Pi expansion board that drives two bipolar stepper motors via integrated DRV8825 drivers. It offers six microstep modes (full-step through 1/32-step), adjustable output current up to 2.5 A, and an onboard power supply capable of up to 3 A output current.

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Technical overview

  • Compatible with Raspberry Pi Zero, Zero W, Zero WH, 2B, 3B, 3B+, 4B and 5.
  • Two integrated DRV8825 driver ICs, each controlling one stepper motor.
  • Microstep setting via DIP switches D0–D5: D0–D2 control motor M1, D3–D5 control motor M2; modes: full-step, half-step, 1/4-, 1/8-, 1/16- and 1/32-step.
  • Driver input voltage range: 8.2 V to 28 V; the MP1584 regulator supports 4.5 V to 28 V input but delivers up to 3 A output.
  • Output current per driver up to 2.5 A, adjustable via potentiometer; sense resistors R13/R16 at 0.2 Ω set the current using the formula Ichop = Vref/(5·R(ISENSE)).
  • Motor connection uses XH2.54 4P connectors; pins A1/A2/B1/B2 belong to M1, A3/A4/B3/B4 to M2.
  • nENBL must be held low to enable the H-bridge output; when high, the bridge is disabled and STEP is ignored.
  • Board measures 65 mm × 56 mm, through-hole diameter 3.0 mm.
  • For software microstepping, six resistors must be soldered on the back and all DIP switches set to 1; default is hardware setting via the DIP switches.
  • The system operates in open-loop mode without position feedback; the drive follows only the pulse count from the microcontroller.

Notes and version constraints

  • Overloading above 2.5 A without additional cooling can damage the driver chip; it is recommended to respect the phase-current limit or add a fan.
  • The exact mapping of DIP switch positions to individual microstep modes is incompletely reproduced in the source (the table “see datasheet page 13” is missing); verify the correct setting in the datasheet before use.
  • The exact command strings for programming are not fully present in the source; only general hints such as 'softward' (Python) and SOFTWARD (C) are given.
  • The current formula assumes a known potentiometer voltage; without measurement the actual output current cannot be determined reliably.
  • The compatibility list refers to the listed Pi models; newer or other boards require separate verification.

Source and revision record

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