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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.
@DanDyse
Well, maybe it's just a matter of the spectral ... the blinking LED is red, human visible. The GL5537 "aims" at 550 nm, which is rather green. The GL5637D is sensitive at 560 nm ... as far as I can see, 580-590nm would make sense ... dont you think?