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I'd have to buy a Raspberry Pi, as well as a TWI LCD module (see below). Not a big deal. I do currently have a Beaglebone Black, but it has HDMI output instead of composite video.
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I think I saw in your code somewhere you were pulling data from what looked like a Mac usb port (/dev/ttS-usb-1433...). Any laptop will work. The python script that writes the json file is laughably simple. Don't run it in Chrome, as Chrome correctly refuses to let web-page javascript to read a local text file. Firefox has no trouble with it.
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This would be the way forward. TWI for the LCD display, and the existing UART serial port for the JSON output.
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Excellent!