Documentation

// INA219 - Arduino Example
// Library: Adafruit INA219

#include <Wire.h>
#include <Adafruit_INA219.h>

Adafruit_INA219 ina219;

void setup() {
  Serial.begin(9600);
  if (!ina219.begin()) {
    Serial.println("INA219 not found at 0x40");
    while (1);
  }
  // ina219.setCalibration_16V_400mA();   // for low-current logging
  // ina219.setCalibration_32V_1A();      // for typical projects
  ina219.setCalibration_32V_2A();         // default
}

void loop() {
  float busV   = ina219.getBusVoltage_V();
  float shuntV = ina219.getShuntVoltage_mV();
  float current_mA = ina219.getCurrent_mA();
  float power_mW   = ina219.getPower_mW();
  float loadV  = busV + (shuntV / 1000.0);

  Serial.print("Bus: ");   Serial.print(busV); Serial.println(" V");
  Serial.print("Load: ");  Serial.print(loadV); Serial.println(" V");
  Serial.print("Current: ");Serial.print(current_mA); Serial.println(" mA");
  Serial.print("Power: ");  Serial.print(power_mW); Serial.println(" mW");
  Serial.println();
  delay(1000);
}

#!/usr/bin/env python3
# Install: pip install adafruit-circuitpython-ina219
# Enable I2C: sudo raspi-config -> Interface Options -> I2C

import time
import board, busio
from adafruit_ina219 import INA219

i2c = busio.I2C(board.SCL, board.SDA)
ina = INA219(i2c)

while True:
    bus = ina.bus_voltage           # V
    shunt = ina.shunt_voltage       # V
    current = ina.current           # mA
    power = ina.power               # W
    print(f"Bus: {bus:.2f}V  Shunt: {shunt*1000:.2f}mV  "
          f"I: {current:.2f}mA  P: {power*1000:.2f}mW")
    time.sleep(1)

# INA219 on Pico - MicroPython
# Install: copy ina219.py from robert-hh/INA219 (or pip install via mip)

from machine import I2C, Pin
from ina219 import INA219
import time

i2c = I2C(0, sda=Pin(4), scl=Pin(5), freq=400000)
ina = INA219(0.1, i2c)
ina.configure(voltage_range=ina.RANGE_16V, gain=ina.GAIN_AUTO)

while True:
    print('Bus: {:.2f}V  Current: {:.2f}mA  Power: {:.2f}mW'.format(
        ina.voltage(), ina.current(), ina.power()))
    time.sleep(1)