“This project is a smart battery monitor. It uses an INA219 sensor to measure voltage, current, and power. The OLED screen shows live readings: volts, amps, power, and battery percentage. I use a bench power supply to simulate the battery voltage dropping to the minimum. In the program, you can manually set the maximum and minimum voltage thresholds. The INA219 module itself can handle bus voltages from 0 up to 26 volts. In this project, I use a resistor as the load, and the system measures the