i did not find any pins on nodemcu named S3, S2, S1. you can check here for which pin you are referring to ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
i did not find any pins on nodemcu named S3, S2, S1. you can check here for which pin you are referring to ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials