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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@ChrisZ
Gordon
I am just tinkering with "Yun Shield" and a Nucleo board I have lying about. The Yun shield is half the price of the official Yun ($30 vs $60US) and does not tie you to a 328 class chip for your analog IO. The Yun Shield does require a serial port mapped to the official Arduino TX/RX pins to work. For now I took of the links bonding the Nucleo serial port to the STLink USB adapter and installed the ones connecting it to the Arduino header. You can always use fly-wires on the pins to reconnect to the STLink.
Starting with a clean sheet of paper one could pair the Pico with a LinkIt Smart: http://www.seeedstudio.com/depot/LinkIt-Smart-7688-p-2573.html. The LinkIt is $15US and has double the RAM/Flash that the Yun does on the OpenWRT side. That combo of Pico analog IO and an Espruino package that runs on the OpenWRT side could truly be a "Yun killer".
ChrisZ