Emergency power supply

Hi everyone
I use charger cable to supply Nodemcu board
I want supply the board as soon as the power cut off by alternate source
But how to swich main source to alternate source?

connect main to the invertor or UPS or power bank and then power esp from it. so mains, is there are not does not matter. the nodemcu will always be powered by inverter or UPS or powerbank.

What are the pins S3, S2, S1, SC, S0, SK? Can I use them as GPIO in Nodemcu?

Thank you for your help!

i did not find any pins on nodemcu named S3, S2, S1. you can check here for which pin you are referring to https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/


shramik_salgaonkar

      Community Manager




    October 6

i did not find any pins on nodemcu named S3, S2, S1. you can check here for which pin you are referring to https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/


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In Reply To


ar.ghasemi94

    October 6

What are the pins S3, S2, S1, SC, S0, SK? Can I use them as GPIO in Nodemcu? Thank you for your help!


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Did you check the link i shared above?

S3 ===> GPIO10 ===> pin is high at BOOT
S2 ===> GPIO09 ===> pin is high at BOOT

SPI

SD1 ===> GPIO12 ===> MOSI
SC ===> GPIO15 ===> CS
SD0 ===> GPIO13 ===> MISO
SK ===> GPIO14 ===> SCLK

I hope you know what does SPI stands for.

Hi i want to Connect Nodemcu board to my mobile phone using access point mode and control a led and monitor temerature .
My mobile app is wifi Controler that exist in google play…
I tried to write the code but I couldn’t. Please help me

what does the serial monitor output?

No problem in connecting the phone to the board … I just want to control an LED, for example if the phrase “on” is sent the LED will turn on … also monitor the temperature through the phone.

Have a look at this: https://developers.mydevices.com/cayenne/docs/getting-started/#getting-started-arduino-actuators