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@user112894
thank you; i tried and it returns a different error:
Uncaught ReferenceError: "A1" is not defined
I think that's to be expected: since the device is a Bangle.js, the only 'pins' available are LED1 and LED2 (as far as i can tell); also, i don't understand why each pin appears twice in your example...
the binary representation of the number yields the same effect, using the pins i'm interested in:
digitalWrite([LED1,LED2],0b0001) => Uncaught Error: Invalid pin!
digitalWrite([LED1,LED2],0b0010) => Uncaught Error: Invalid pin!
digitalWrite([LED1,LED2],0b0100) => Uncaught Error: Invalid pin!
digitalWrite([LED1,LED2],0b1000) => Uncaught Error: Invalid pin!
It looks like on the watch the virtual pins "LED1\2" work only if used one at a time, not both.
Could that be the case?