Project Summary: Custom IoT PCB with ESP32-C3-02 and TP4056 Li-ion Charger

This project involves the design and development of a custom PCB for an IoT application powered by the ESP32-C3-02 SoC. The board includes integrated power management features using the TP4056 Li-ion battery charger IC, enabling efficient and safe charging of a single-cell Li-ion battery.

Key Features

• Microcontroller: ESP32-C3-02 SoC for Wi-Fi and BLE connectivity.
• Power Management: TP4056 IC for single-cell Li-ion battery charging with thermal regulation.
• Battery Protection: Integrated under-voltage lockout and trickle charging.
• Sensors and Modules:
  • BME280 for temperature, humidity, and pressure sensing.
  • Ambient light and sound sensors.
  • Mini SD card reader for data storage.
  • Flash memory for additional storage.
• Display: I2C OLED for real-time data visualization.
• Power Inputs:
  • USB-C connector for charging and data transfer.
  • LiPo battery connector with onboard charging circuitry.
• Indicators: LED indicators for charge status (charging and full).

Design Highlights

1. Power Supply Integration:

   • USB-C provides power for both charging and system operation.
   • TP4056 handles battery charging and protection.
   • Power supplied to the ESP32-C3-02 is regulated for stability.

2. Modular Architecture:

   • Supports various sensors and peripherals for IoT applications.
   • Expandable via additional I2C devices.

3. Safe and Efficient Charging:

   • Programmable charging current using an external resistor.
   • Automatic charge termination and battery protection.

4. Compact and Reliable Layout:

   • Optimized PCB traces for minimal power loss.
   • Thermal management for the TP4056 and other components.

Applications

• IoT edge devices for environmental monitoring.
• Battery-powered data logging systems.
• Prototyping platform for ESP32-based projects.

Repository Contents

• Schematic and PCB Layout: KiCad files for the board design.
• Firmware: Source code for the ESP32-C3-02 to interface with sensors and peripherals.
• Documentation:
  • Datasheets for the TP4056 and other components.
  • Assembly instructions.
  • Testing procedures.
• License: MIT License.

This repository is a complete resource for designing and building a robust IoT solution with integrated power management and ESP32 connectivity.