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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
I think it's just that when you've executing JS the chip is drawing more power and that's depleting the voltage in the capacitors, so the more times you read the more it's awake for and the lower the voltage.
It's why I asked about turning the LED on as that draw about twice as much as executing JS, so it's a good way to see how much the voltage drops!