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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
What OS is the computer running? If it's a Mac, Linux or Android then you can get the Espruino Pico to pretend to be a USB keyboard or mouse, which makes getting input in easy: http://www.espruino.com/USB
Otherwise, you can talk over USB Serial, but webpages (unless they're Chrome Web Apps) aren't allowed to do that.
The other super-hacky solution is to use the headphone/mic jack and the Web Audio API to get data into the PC: http://www.espruino.com/Headphone
Potentially you could do that without a Pico at all, but it's quite likely the Webpage could glitch and miss the 'edge' created by the motion sensor - it might be easier to use an Espruino to create a square wave on the input pin when motion was detected - then it's far less likely that it'll get missed.