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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
That all looks good to me. Have you checked that the voltage does stay constant? You're not using
setDeepSleep(1)in your code - which is fine, but the board could draw around 30mA without it - which may be running down your supercapacitor?Maybe you could try adding some
digitalPulse(LED1,1,10)commands for the 3 LEDs, to make sure that the board is running the code you expect. If the voltage from the Pololu board has increased slowly then the board might have 'browned out'.One other thing to watch out for is that when you plug in USB, the voltage will then come in through Espruino's voltage regulator - hopefully the Pololu module won't mind having power on its output while it itself is unpowered?
Come to think of it, does the board run reliably while connected to USB?