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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.
@maze1980
My favorite logic level shifter is the BSS138. With two resistors it works bi-directional, if you use only one resistor it's unidirectional. It doesn't invert the signal.
"bi-directional-logic-level-converter-hookup-guide" will find relevant documentation.