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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.
@DrAzzy
I have noticed flickering in PWM-controlled LEDs (external LEDs driven off a ULN2803, also on an external breakout board) when running off a benchtop power supply with stable output voltage and controlled by bluetooth It happened only after some time had passed, and I could see the current change as it did (these were 1W leds >.>). I'd set them with analogWrite(pin,1); so they should have been on full time anyway....
So there may be a deeper issue here. I won't say my results are meaningful until I've re-run it with proper heatsinking on the LEDs and driver (they both get pretty hot) - I have a heatsunk setup assembled, but have not driven it from Espruino yet.
I have ruled out loose connections, though, as the flickering does not react to jiggling the wires.