シナリオ
An IoT device with ESP32 needs to monitor battery voltage while minimising power consumption in deep sleep. An external ADC provides higher accuracy and an RTC timestamps readings.
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01
Using external ADS1115 ADC for better resolution and I2C interface
02
Low‑side NMOS to disconnect voltage divider when GPIO low during deep sleep
03
LDO regulator to derive 3.3 V from battery
Suitable for any battery‑powered ESP32 project requiring accurate battery monitoring and data logging with RTC.