![]() When we set the RST pin is low, the ESP8266 resets. These LED works on inverted logic, If you send a HIGH signal to turn it off, and a LOW signal to turn it on RST Pin Credits: NodeMCU has two build-in LEDs and we can use them for testing purposes.LED is usually connected to GPIO2 and GPIO16 Credits: GPIO4 and GPIO5 are the most safe to use GPIOs if you want to operate relays On-board LED So, these pins are not recommended to use as input/output functions. Pins referred to as GPIO6 to GPIO11 are connected to the flash chip in ESP8266. NOTE : Pins labeled as RX and ADO are recommended to use as outputs and TX pin not recommend to use as input
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