상황
A compact ESP32-based wearable fitness tracker powered by a single-cell LiPo battery, using a 3.3V LDO for the MCU and sensors, and sharing an I2C bus for the heart rate sensor and OLED display.
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01
Use a 3.3V LDO to power the ESP32 and peripherals from the LiPo battery
02
Connect heart rate sensor and OLED on the same I2C bus with pull-up resistors
03
Add a reset pushbutton with pull-up and a battery voltage divider for ADC monitoring
Use this structure for battery-powered ESP32 wearables, environmental monitors, or any compact IoT device needing I2C sensors, a display, and a stable 3.3V rail.