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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.
@Gordon
Hi,
Yes, this sounds like it could be a great project...
By PPM, do you mean the usual mechanism for controlling Analog model aircraft servos? If so, Espruino already does this quite well.
For OSD, there are chips such as this one that would work pretty well: https://www.sparkfun.com/products/9168
I'm unsure if they do graphics, but you'd think that there would be one that does.