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Green rectangular circuit board with two black driver chips, white connectors and a 40-pin header

WaveShare

WaveShare Stepper Motor HAT B dual HR8825 2.5A 8.2-28V 65x56mm

SKU CH-8EAV-X90GS

Dual HR8825 driver drives two stepper motors up to 1/32 microstepping with 2.5A current and 8.2-28V supply for Raspberry Pi or Jetson Nano

  • CPU TypeOther
  • Drives two stepper motors with dual HR8825 chips
  • Six microstepping modes up to 1/32-step via DIP switches
  • Adjustable current up to 2.5A with OCP, TSD and UVLO protection
  • Onboard 5V regulator powers Raspberry Pi through 40-pin GPIO header
  • Compact 65x56mm board supports 8.2-28V motor supply

Dual HR8825 driver board for Raspberry Pi

This HAT plugs into the standard 40-pin GPIO header and provides two independent stepper motor channels. It is aimed at makers and engineers building 3D printers, sculpturing machines or mechanical arms that need coordinated motion control from a single-board computer. The onboard 5 V regulator can feed the host board, simplifying wiring in compact projects.

Six microstepping modes up to 1/32-step

DIP switches select full-step, half-step, 1/4, 1/8, 1/16 or 1/32 microstepping for each channel. A potentiometer sets the drive current up to the 2.5 A maximum per motor. Overcurrent protection, thermal shutdown and VM undervoltage lockout protect the HR8825 chips during prolonged operation, so the board sustains rated current without relying on short-burst headroom.

8.2 V to 28 V motor supply range and 3.3 V logic

Motors are powered from an external supply between 8.2 V and 28 V while the logic side runs at 3.3 V, matching Raspberry Pi and Jetson Nano I/O levels. The 65 mm by 56 mm PCB uses 3 mm mounting holes and offers multiple motor connector styles for different stepper specifications. Development examples in BCM2835, wiringPi and Python are provided to accelerate integration.

Highlights

  • Drives two stepper motors with dual HR8825 chips
  • Six microstepping modes up to 1/32-step via DIP switches
  • Adjustable current up to 2.5A with OCP, TSD and UVLO protection
  • Onboard 5V regulator powers Raspberry Pi through 40-pin GPIO header
  • Compact 65x56mm board supports 8.2-28V motor supply

Specifications

CPU TypeOther

Questions about this item

How much heat and power does the dual HR8825 HAT draw when driving two steppers at 2.5 A all day?

Each HR8825 chip is rated for 2.5 A peak output and includes thermal shutdown protection, so sustained loads stay within the 8.2–28 V supply range without extra cooling.

Which Raspberry Pi or Jetson board and power supply must I already own for this HAT to work?

It fits any Raspberry Pi with the standard 40-pin GPIO header or a Jetson Nano and uses the onboard 5 V regulator to feed the host, so you only need a 8.2–28 V motor supply.

Will the 3.3 V logic on this HAT talk reliably to older 5 V Arduino shields I want to keep using?

The HAT’s logic level is fixed at 3.3 V to match the Pi and Jetson Nano; level-shifting would be required for 5 V peripherals.

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