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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
Yep - pretty much everything has a bit of capacitance in it, and there could be very small resistances to other pins as well. It's totally normal.
For a really simple example, even if you just press your finger so it covers C0 and some other pins, I bet it will totally change the values you read.