The INA226 is a precision digital current and voltage monitor designed to measure bus voltage, shunt voltage, current, and power in electronic circuits.

It communicates through the I²C interface and is commonly used in battery monitoring, solar power projects, power supplies, IoT devices, and energy measurement systems.

Specifications
 

Example
 

The code below reads only the bus voltage between VBS and GND.

#include <Wire.h>
#include <INA226_WE.h>

INA226_WE ina226(0x40);

void setup() {
  Serial.begin(115200);

  Wire.begin(D2, D1);

  ina226.init();
}

void loop() {
  float voltage = ina226.getBusVoltage_V();

  Serial.print("Voltage: ");
  Serial.print(voltage, 3);
  Serial.println(" V");

  delay(1000);
}

The code initializes the INA226 sensor at I2C address 0x40 and reads the bus voltage using getBusVoltage_V(). The measured value is printed to the Serial Monitor in volts.

Output

This simple example is useful when you only need to monitor the voltage of a power line, battery, solar panel, or external supply connected between VBS and GND.

Note: This example only reads the bus voltage. The INA226 can also measure current and power when a shunt resistor is used and the sensor is correctly configured.