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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.
Mrbbp
As @allObjects points out above it looks like you're better off using a Graphics instance that's 8 pixels high (with vertical byte). While it 'wastes' one pixel per column (which isn't much for 5 columns!) it means it's way easier to access the Graphics ArrayBuffer's data!