How can I connect AA battery to power ESP32 development board Vin pin and operate WiFi and Bluetooth modes normally? Which AA battery is to be used ? How many ? In series or parallel?
We recommend using rechargeable lipo batteries.
If you want to use an AA battery, you need to take into account that you must feed 5V on the VIN pin.
In any of the cases, you need to use a low dropout voltage regulator. Like it’s used in this project:
(Just ignore the solar panels section, take a look at the circuit after the battery)
I hope this helps.