Subir Datta asked 2 years ago
It is required in a home automation project to restore the settings of all gadgets / devices to the same level as they were before power failure. How do I keep the program running in NodeMCU during 5 volt supply failure with a Lithium button cell of 3 volt? There are some commercial sets available with this feature.
2 Answers
Sara Santos Staff answered 2 years ago
Hi.
I don’t think it is possible to power the ESP8266 properly using a button cell of 3V.
You need at least 3.3V for the ESP8266 to operate properly.
Regards,
Sara
Steve Mercer answered 2 years ago
I’m guessing here but you could probably use an external RTC to save settings and power that RTC with a 3V button cell.