The idea for this module arose from the need to provide autonomy to my ESP32-S3 modules from the manufacturer VCC-GND, one of the most popular development kits for the ESP32 outside of Espressif itself.

This module provides autonomy to the YD-ESP32-S3 development board, integrating a rechargeable 18650 battery with charge control, protection, and regulated outputs. It also exposes a 14-pin connector with 5V and 3.3V voltages and some GPIOs for connecting sensors or other peripherals.

Main features

• Battery: Rechargeable 18650 cell (Li-Ion).
• Charging Management:
• Integrated TP4056 for USB charging.
• Standard charging current (1A max, configurable with resistor).
• Battery Protection:
• DW01A + dual MOSFET circuit for overcharge, overdischarge, and overcurrent.
• Power Supplies:
• Regulated 5V: Constant output to power the YD-ESP32-S3 board.
• Regulated 3.3V (optional): Available for low-voltage sensors and peripherals.
• 14-pin Expansion Connector:
• 5V and 3.3V outputs.
• Some exposed GPIOs of the ESP32-S3.
• Common GND.

Considerations

• The module is intended for standalone use in projects involving the YD-ESP32-S3.
• The 5V output must always be available, as it is the primary power source for the ESP32-S3.
• The 3.3V output is optional and is primarily intended for low-power sensors.
• The protection circuit prevents battery damage, but it is recommended to always use quality 18650 cells with internal protection.

Future improvements

• Support for solar panel charging (MPPT or "solar-friendly" charger).
• Integration of an I²C fuel gauge (e.g., MAX17048) to report battery level.
• General on/off switch.
• Ultra-low-power modes for long-running projects.

Licence

OSHWA UID

PE000002