INA219 I²C current and power monitor module — 26V, 3.2A, 12-bit ADC

The INA219 is a high-side DC current and power monitor IC from Texas Instruments, available here as a ready-to-use breakout module. It measures bus voltage, shunt voltage, current, and calculated power over I²C, making it ideal for battery monitoring, solar charge tracking, and any application where precise power consumption measurement is needed. With a 12-bit ADC and programmable gain, it delivers accurate readings across a wide range of currents without interrupting the power path.Key Specifications: Monitor IC: Texas Instruments INA219 Interface: I²C (addresses 0x40 – 0x4F, configurable via A0/A1 pads) Bus voltage range: 0V – 26V Max current: ±3.2A (with onboard 0.1Ω shunt resistor) ADC resolution: 12-bit Shunt resistor: 0.1Ω (onboard) Current resolution: ~0.8mA (default), up to 0.1mA with calibration Power resolution: ~0.4mW Supply voltage (VS): 3.0V – 5.5V Quiescent current: 1mA (max) Operating temperature: −40°C to +125°C Module dimensions: ~25mm × 10mm Measured Parameters: Shunt voltage: voltage across the shunt resistor (±320mV range) Bus voltage: voltage on the load side (0 – 26V) Current: calculated from shunt voltage and calibration register Power: calculated internally (bus voltage × current) Pinout: VCC: 3.3V – 5V power input GND: Ground SDA: I²C data SCL: I²C clock VIN+: High-side power input (connect to power supply positive) VIN−: Load output (connect to load positive terminal) A0, A1: I²C address configuration pads I²C Address Configuration: A1=GND, A0=GND → 0x40 (default) A1=GND, A0=VCC → 0x41 A1=VCC, A0=GND → 0x44 A1=VCC, A0=VCC → 0x45 Compatible With: Arduino Uno, Nano, Mega (Adafruit INA219 library) ESP32 and ESP8266 Raspberry Pi (Python adafruit-circuitpython-ina219) STM32 and other I²C-capable MCUs Applications: Battery charge/discharge monitoring Solar panel and MPPT current tracking USB power delivery monitoring IoT device power profiling Motor current sensing Smart power distribution boards