Piunora has the guts of a Raspberry Pi 4 with Arduino form factor, M.2 PCIe socket

The Raspberry Pi 4 is a pretty cool board, but if you wished it was just a bit smaller, and you could use the PCIe interface exposed by the Broadcom BCM2711 processor more easily, Timon has designed Piunora carrier board for the Raspberry Pi Compute Module 4.

The solution provides a board with the guts of Raspberry Pi 4 SBC but using the Arduino form factor including access to the six ADC pins, and an M.2 socket with the PCIe signal from the Broadcom SoC.

Piunora carrier board (preliminary)specifications:

  • SoM compatibility – Raspberry Pi CM4 module with Broadcom BCM2711 quad-core Cortex-A72 processor @ 1.5 GHz, 1 to 8GB RAM, optional 4GB to 32GB eMMC flash, optional wireless module with 802.11b/g/n/ac WiFi 5 and Bluetooth 5.0
  • Storage – 1x MicroSD card socket (for the OS when using Raspberry Pi CM4Lite system-on-module)
  • Video Output – 1x HDMI 2.0 port up to 4Kp60
  • Camera I/F – MIPI camera connector
  • USB – 1x USB 2.0 port, 1x USB-C port with support for data and power; device/host switch.
  • Expansion
    • Arduino compatible header with markings – 6x ADC, digital I/Os, I2C, SPI, UART, etc…
    • Qwiic/Stemma QT connector
    • M.2 B-key socket with PCIe signals
  • Misc – 4x RGB LEDs, dual-mode button (user/boot mode for flashing eMMC flash)
  • Power Supply
    • 5V via USB-C port (board power)
    • Extra USB-C port (bottom side) for optional power-in for very high current M.2 devices
  • Dimensions – Adafruit Metro / Arduino UNO form factor
Camera connector and M.2 socket fitted with Google Coral AI card

Most Raspberry Pi 4 applications would be suitable for the board, but Timon designed it specifically with CircuitPython in mind, as he intends to mount the Pi as a USB gadget instead of a host device, and follow the same development workflow as a normal MCU development board directly on the computer.

The board is still under development, but progress is going well, as the last Twitter update reveals everything works as expected on the first revision of the board.

While it seems there will still be a Revision 2 of the board, Timon is looking for distributors, and I suppose it may become available in the first part of 2021. You can register your interest if you’d like to know when the board will launch. Alternatively, you could also subscribe to CNX Software RSS feed or by email ;). As a side note, it’s not the first time I’ve written about his work this week, as he designed the enclosure for the Glasgow Interface Explorer hardware debugging board.

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