Smart 18650 Battery Charger with OLED

Build your own 3D-printed smart 18650 battery charger with real-time charging monitoring!

This project combines a custom 3D-printed enclosure, an ESP32-C3 SuperMini, an INA219 current sensor, a TP4056 charging module, and an OLED display to create a compact and practical battery charging station.

⚡ Features Real-time charging current monitoring in mA. Charging capacity tracking in mAh. Battery voltage measurement when not charging. Estimated battery percentage displayed on the OLED. Automatic battery detection with a "NO BATTERY" message. Automatic switching between charging and idle modes. Standalone operation without Wi-Fi or a computer. 🔧 Components ESP32-C3 SuperMini

https://s.click.aliexpress.com/e/_c3TOjHOr

https://s.click.aliexpress.com/e/_c38GxeoJ

INA219 Current and Voltage Sensor

https://s.click.aliexpress.com/e/_c4ShXJob

https://s.click.aliexpress.com/e/_c39QjCzD

https://s.click.aliexpress.com/e/_c3PuMCgr

TP4056 USB-C Charging Module

https://s.click.aliexpress.com/e/_c4kJ4L2P

https://s.click.aliexpress.com/e/_c3bvh26L

https://s.click.aliexpress.com/e/_c4McfTIn

0.96-inch OLED Display

https://s.click.aliexpress.com/e/_c4Esig6x

https://s.click.aliexpress.com/e/_c3PabbZ5

https://s.click.aliexpress.com/e/_c3yfV0Fd

18650 Battery Holder MT3608 DC-DC Boost Converter

https://s.click.aliexpress.com/e/_c4cTeCaL

https://s.click.aliexpress.com/e/_c4qNFLYT

https://s.click.aliexpress.com/e/_c3DMmxG

Connecting Wires AA Battery Holder (3 Batteries) https://s.click.aliexpress.com/e/_c3evEWhD

https://s.click.aliexpress.com/e/_c4oemw1Z

Reverse Polarity Protection Module

https://s.click.aliexpress.com/e/_c4SrQcb9

https://s.click.aliexpress.com/e/_c3j6iK6j

https://s.click.aliexpress.com/e/_c3zs0DwX

18650 Battery Holder

https://s.click.aliexpress.com/e/_c412Q1G7

https://s.click.aliexpress.com/e/_c3wmiaYn