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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.
@allObjects
to control brightness.
Some of these LCD carrier/breakout boards use a setting with a transistor (and current limiting resistor) to drive the backlight LED(s) to allow power feeding from a 5V and controlling from a 3.3V. With separate power and a PWM GPIO in control, brightness control is optimal.