Computing stuff tied to the physical world

Embedded Linux – Carambola 2

In Hardware, Linux on May 6, 2013 at 00:01

This has got to be one of the lowest-cost and simplest embedded Linux boards out there:


It’s the Carambola 2 by

Screen Shot 2013-05-04 at 11.02.06

The 28 x 38 mm (!) bare board is €19 excl VAT and shipping, and the development bundle (as shown above) is €33. The latter has a Carambola2 permanently soldered onto it, with 2 Ethernet ports, a slave USB / console / power port, a USB host port, a WiFi chip antenna (which is no longer on the base board, unlike the original Carambola), and a switching power supply to generate 3.3V from the USB’s 5V.

The processor is a MIPS-based Atheros chip, and with 64 MB ram and 11 MB of available flash space, there is ample room to pre-populate this board with a lot of files and software.

The convenience of the development setup, is that it includes an FTDI chip, so it comes up as a USB serial connection – you just need to find out what port it’s on, connect to it at 115200 baud via a terminal utility such as “screen” on Mac or Linux, and you’ll be hacking around in OpenWrt Linux in no time.

Note that this setup is very different from a Raspberry Pi: MIPS ≠ ARM, for one. The RPi has a lot more performance and RAM, has hardware floating point, and is more like a complete (portable) computer with its HDMI video out port. The benefit of the Carambola 2 is its built-in WiFi, built-in flash, and its low power – more on that tomorrow.

  1. This is indeed an intersting option for a low-power datalogger/webserver. The CPU is the same as in the TPLink WR703N, but according to 8devices the carambola is little-endian, whereas the WR703N is big-endian:

    This means that there is a big chance that node.js can be compiled for the carambola. For MIPS big-endian nobody seems to have achieved this yet.

  2. For Wifi I just found this one that looks interesting.

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