Erriez INA219 I2C/SMB Voltage/Current/Power Monitor library for Arduino

This is an INA219 I2C/SMB DC Voltage/Current/Power sensor library for Arduino.

Library features

• High Accuracy: max 0.5%
• Measure Voltage 0..26V DC
• Measure Current 0..2000mA DC (with default 0.1 Ohm shunt)
• Measure Power in Watt (Software Voltage * Current calculation)
• Configurable shunt resistor value
• Configurable I2C address for multiple sensors
• Power-down / power-up control
• Low-level register access

Hardware

Any Arduino hardware with a TWI interface and Wire.h support.

Examples

• ErriezINA219AutoRange Auto range example.
• ErriezINA219GettingStarted Getting started example.
• ErriezINA219SerialPlotter Serial Plotter example.

Documentation

• Doxygen online HTML
• Doxygen PDF
• INA219 datasheet

Library dependencies

• Wire.h

Getting started

#include <Arduino.h>
#include <Wire.h>
#include <ErriezINA219.h>
// Default I2C Address 0x40
#define INA219_I2C_ADDRESS      0x40
// 0.1 Ohm shunt resistor
#define INA219_SHUNT_RESISTOR   0.1
// Create INA219 sensor object
INA219 ina219 = INA219(INA219_I2C_ADDRESS, INA219_SHUNT_RESISTOR);
void setup()
{
    // Initialize serial port
    Serial.begin(115200);
    while (!Serial) {
        ;
    }
    Serial.println(F("\nErriez INA219 voltage, current and power sensor example\n"));
    // Initialize I2C
    Wire.begin();
    Wire.setClock(400000);
    // Initialize INA219
    while (!ina219.begin()) {
        Serial.println(F("Error: INA219 not detected"));
        delay(3000);
    }
}
void loop()
{
    // Read from sensor
    if (!ina219.read()) {
        Serial.println(F("Error: INA219 read failed"));
        return;
    }
    // Check valid conversion
    if (!ina219.available) {
        Serial.println(F("Error: INA219 not available"));
        return;
    }
    // Print result
    Serial.println(F("INA219:"));
    Serial.print(F("  Bus voltage:   "));
    Serial.print(ina219.busVoltage, 2);
    Serial.println(F(" V"));
    Serial.print(F("  Shunt voltage: "));
    Serial.print(ina219.shuntVoltage / 1000, 1);
    Serial.println(F(" V"));
    Serial.print(F("  Current:       "));
    Serial.print(ina219.current / 1000, 1);
    Serial.println(F(" A"));
    Serial.print(F("  Power:         "));
    Serial.print(ina219.power / 1000, 1);
    Serial.println(F(" W"));
    // Wait some time
    delay(1000);
}

Library installation

Please refer to the Wiki page.

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