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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
Nice - that's still pretty compact! I'm not sure if MQTT really would increase the power requirements much. Surely you actually want it serving up a webpage with control via Websockets? :)
If you wanted to add a super hacky camera to it, you could look at: http://www.espruino.com/ADNS5050
This is the kind of thing that you could design a custom PCB for pretty easily (Just the ESP12 and motor driver) - with it you might even be able to fit the top back on the car :)