In this tutorial we have covered a beginner level project with NodeMCU. An ESP8266 is programmed to display ‘0’ to ‘9’ and ‘a’ to ‘f’ on the Seven Segment Display.

Some people state that ESP8266 is tolerant of 5 V logic levels on its GPIOs, while others vehemently disagree, pointing at the datasheet-stated 3.6 V maximum. Datasheets aren’t source code fo… ...