Robo HAT MM1

An open source robotics and automation controller for Raspberry Pi.

The Robotics Masters Robo HAT MM1 is an open source robotics controller board for Raspberry Pi. It removes the initial barriers to starting any robotics project by providing all the hardware you need in one easy form factor. The wide compatibility with many open source software libraries such as CircuitPython, SeeSaw, and Arduino IDE gives you many options for getting your project to work. The hardware schematics and software will be fully available and open source without limitations.

Features and Specifications

  • Raspberry Pi Compatibility (all models with 40-pin header):
    • Model B+, 2B, 2B+, 3B, and 3B+
    • Model A+ and 3A+
    • Zero and Zero W
  • Dimensions:
    • Standard HAT Format (width x depth): 65 mm x 56.5 mm
    • height: TBC
  • Sensors:
    • Accelerometer, Gyroscope, Magnetometer in IMU (MPU-9250)
    • Current Sensor (INA219)
    • Additional space for more sensors in the future (pressure sensor, duel IMU)
  • Processor:
    • 48 MHz SAM D21G
    • 256 KB Internal Flash
    • 8 MiB SPI External Flash Storage
  • Connectivity:
    • 24 programmable Input/Output:
      • 9 x General I/O
      • 8 x 16-bit Servo Output (programmable up to 24-bit)
      • 6 x direct to Raspberry Pi (SW programming, Control, Serial Console)
      • 4 x 16-bit RC Controller Input
      • NEOPIXEL Output
    • JST DroneCode Complaint Connectors:
      • GPS
      • UART
      • SPI
      • I2C
    • USB to serial pass-through to communicate with Raspberry Pi ‘in the field’
  • Power:
    • on-board 5V Regulator (for Raspberry Pi, Servos)
    • on-board small LiPo Battery Charger (for Raspberry Pi)
    • battery pass-through (for Servo, ESC, Raspberry Pi)
    • independent servo power rail (for back-powering from ESC)

Software Compatibility

We wanted a wide range of software libraries to work on the Robo HAT MM1 to enable anyone to build the project that they want. This has the added benefit that the Robo HAT MM1 is able to work in a wide range of use-cases.


  • CircuitPython (running on the device)
  • SeeSaw (with CircuitPython on Raspberry Pi)
  • Arduino IDE

In Research / Development

We believe that these libraries can be added on in the future for expanding the number of projects that you can do. We plan on starting work on these libraries in the near future.

  • Scratch Environment (in development)
  • PX4 (DroneCode) Flight Control (researching)
  • ArduPilot Control (researching)

Use Cases

  • Autonomous vehiclesDonkey Car, DIY Robocar, ArduPilot and more.
  • Educators – easy to use for school aged students (testing underway).
  • Makers and Hackers – anyone looking to have fun or create something new with robotics.

Support and Documentation:

All the documentation and software will be available on the Robotics Masters GitHub. There are also other useful websites out there that you can find below: