I'm using nodeMCU. There are these pin S2 and S3 that represent GPIO9 and GPIO10. I want to use these pin but it does not behave like the other GPIO pin. I need help to understand what is pin S2 and S3. Please explain to me why it behave differently with the other GPIO. How can I use these two pins?
Hi,
The NODEMCU module has a module similar to the ESP8266 12E.
Inside the ESP8266 12E module there is an ESP8266 chip and a memory chip, where the programs that we load in the ESP are kept.
The communication between the ESP chip and this memory is done through GPIOS 6, 7, 8 9 10 and 11.
You should not use these GPIOS for any other application as it will interfere with the flow of the program.
So does it means there is no way at all to use that pin?
Hi,
Yes, you cannot use these pins for other functions.
I see, thank you for all the informations.
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