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Thanks for the Instructable. I'm having fun playing with my new Nextion. I can't wait to try out your Arduino code as it seems very straight forward......Except for the part where you're driving a device that consumes 90ma from a port (7) that only supplies 40ma max. Maybe a transistor should be used to supply the required current. I hope nobody fries their Nextion.
I was getting garbage output until I changed the Baud rate from (9600) to (38400). works great now.