The Quub

Open-source microcontroller system based on a core processor and addressable daughter boards.

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Processor independent, processor boards are being designed with an 8-bit AVR ATmega2560, and 32-bit SAM3X8E at this point.

Small form factor, nominally 2.2 x 2.2 inches (56x56mm).

Daughter boards can be stacked above or below the core processor.

34-way backplane using stackable headers or a physical backplane just like the "old days".

Backplane has provision for I2C, SPI, UART, vectored interrupts.

Can detect multiple modules at the same address.

Special consideration paid to make multi-processor systems easier to develop.

Up to 16 daughter boards can be addressed and can therefore share the same system IO lines.

Each daughter board can in turn have up to 4 addressed modules.

Daughter boards can be dumb IO or smart co-processors.

Four vectored interrupts supported from each daughter board making a total of 64 interrupt sources on a system.

5V and 3V3 modules can co-exist.

Unique module IDs can be read by the core processor.

The first core processor board is based on an ATmega2560, it supports Arduino shields (Duemilanove/Uno format) on one side and Quub modules on the other.

  • New version being considered

    rob09/09/2019 at 01:00 0 comments

    This project has languished for a long time but I think I will resurrect it. 

    The format will change but still be similar in many ways, with stackable boards and solder-on front panels. The main difference is that the new design uses an LPC1549 ARM processor and has built in RS485 networking using a protocol I am designing called R3N (Robust Redundant Ring Network).

    Why bother when you can run Linux and WiFi or Ethernet on a board 1" square these days? I dunno, I just like doing this stuff and I can see uses for it.

  • Boards back from PCBA

    rob09/24/2014 at 21:55 0 comments

  • PCB and PCBA in progress

    rob05/06/2014 at 23:29 0 comments

    The design files have been sent to a company in the UK, they wil fab the PCB and load four boards with components for use as prototypes.

  • Website up

    rob03/10/2014 at 13:47 0 comments

    The Quub website ( is up, actually it's been up for some time but needed re-jigging because there has been a lot of changes to the Quub design recently that were not reflected on the site.

    The information is still a bit sparse, but what is there should be in line with the final Quub design.

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rob wrote 03/09/2014 at 22:48 point
PCB design finished for the first core processor board, an ATmega2560 with 512k external SRAM. Getting PCBA quotes for first prototypes soon.

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