LiPo Charger Arduino

A DIY LiPo/Li-ion battery charger with internal resistance measurement and State of Health (SoH) estimation, built using an Arduino Pro Mini.

Features

• Adjustable charging voltage/current via LM2596 (PWM-controlled).
• Measures battery voltage, current, and internal resistance using INA219.
• Displays data on a 0.96" I2C OLED.
• Menu navigation via rotary encoder with buzzer feedback.
• Stores 4 battery presets in EEPROM.
• Calibration mode for INA219 accuracy.
• Safety features: reverse polarity protection, watchdog timer, over/under-voltage alerts.

Hardware Requirements

• Arduino Pro Mini (5V, 16MHz)
• INA219 Current/Voltage Sensor
• LM2596 DC-DC Buck Converter (modified for PWM control)
• 0.96" I2C OLED Display
• Rotary Encoder with Push Button
• 12V 3A Power Supply
• Schottky Diode, Buzzer, MOSFET (IRF540), 0.1Ω Shunt, 10Ω Load Resistor
• Capacitors, resistors, etc. (see docs/hardware.md)

Setup

1. Clone the Repository:

   git clone https://github.com/Synthesizer248/pro-mini-lipo.git

2.Install Libraries: -Adafruit_INA219 -U8g2 3.Encoder Install via Arduino IDE Library Manager. 4.Upload Code: Open src/LiPoCharger.ino in Arduino IDE and upload to your Pro Mini. 5.Assemble Hardware: Follow docs/hardware.md for wiring details. 6.Test: Power on, use the encoder to navigate, and charge a battery.

Usage

See 'docs/usage.md' for detailed instructions on charging, resistance measurement, and calibration.

License This project is licensed under the 'MIT License' - see the LICENSE file.

Contributing Pull requests are welcome! Please open an issue first to discuss changes.