The WiFi remote control is based on ESP32 Pico D4 MCU and 160x80 pixel mini TFT display. Additionally, there are onboard I2C temperature and humidity sensors and an accelerometer.
The power latch circuit ensures that the ESP32 Pico D4 does not need to enter deep sleep mode when powered off. This brings it down to around 3µA during "sleep" due to battery protection. It can only be woken up via the middle button. Battery protection takes up reverse voltage protection via mosfet. The over-discharge voltage of the XB5353A is 2.4 volts, for safety reasons only. Battery voltage should always be checked using a voltage divider to estimate battery status.
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