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How to decrease the deep-sleep current of ESP32-CAMPrint

ESP32-CAM is very popular development board which contains Wi-Fi and Bluetooth connectivity with ESP32 module, OV2640 camera, slot for microSD card and programmer - USB-UART convertor.
These parts are designed on 27x40 mm board.
I wanted to power the board by batteries, so my goal was to decrease the current in the deep-sleep mode and also in the runnning mode.
The deep-sleep current was more than 5mA with the default hardware.

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