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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
Looking at the MAX7291 and family datasheet, I see 5V operation (minimum 4V). Trying to run it with 3.3V does for sure call for trouble... also the power consumption could be an issue.
What Espruino Board are you using to drive the display board?