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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.
@CanyonCasa
As pointed out you likely don't need any level shifting. Most 5V I2C inputs have logic thresholds compatible with 3V logic. But for reference... http://www.nxp.com/documents/application_note/AN10441.pdf