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The logic level voltage of nodemcuHow to convert arduino operating voltage level from 5v to 3.3v (warning 3v lm317 5v 9v 230v.
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HOW TO CONVERT ARDUINO OPERATING VOLTAGE LEVEL FROM 5V TO 3.3V (Warning
The logic level voltage of NodeMCU - Solved - Blynk Community
5V to 3.3V logic level translation/conversion/shifting: how to
How to get DC 3.3v,5v,9v,12v from 230V AC mains using lm317? - YouTube