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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
Wow, good find! That's amazingly cheap!
I had a quick google and I couldn't find much information about the sensor. I'm pretty sure it'd be easy enough to connect, but it's finding out how.
I think realistically, unless you can find someone else who has connected it to a Pi, Arduino, or something, you'd have to take it to bits, take some photos, and post them up.
I guess for £2.50 you could probably afford to buy two and break one apart if it's not obvious how to get into it.
Most likely it'll be a hall effect device - there'll be 3 wires you need to connect, one will be GND, one power, and one will be an output that pulses once for each revolution. It's then pretty easy to count that with the Pico...