INA219 Current/Power Monitor

Operating Voltage

3 V

Operating Voltage

5.5 V

Bus Voltage Range

0 V

Bus Voltage Range

26 V

Interface

I2C/SMBUS

Supply Current

1 mA

Temperature Range

-40 °C

Temperature Range

125 °C

Accuracy

0.5 %

Resolution

12 bit

Package

SOT23-8, SOIC-8

Runs from 3-5.5 V (per the datasheet specs) on I2C/SMBus and can measure a bus voltage up to 26 V on the high side independent of its own supply.

• Current / power / voltage monitoring of a load
• Battery and solar power telemetry
• Bench-supply and energy dashboards

• Place the shunt in the high-side path; size it for your max current.
• Up to four addresses via the A0/A1 pins for multiple monitors on one bus.
• Provide I2C pull-ups; keep shunt sense traces short and matched.

• ESP32 DevKitC (WROOM-32)Espressif · ESP32-WROOM-32
• Raspberry Pi PicoRaspberry Pi · RP2040
• SSD1306 OLED DriverSSD1306 · Solomon Systech

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

// INA219 current / power monitor (I2C) — community starter example
#include <Wire.h>
#include <Adafruit_INA219.h>

Adafruit_INA219 ina;

void setup() {
  Serial.begin(115200);
  if (!ina.begin()) { Serial.println("INA219 not found"); while (1) delay(10); }
}

void loop() {
  Serial.print("V="); Serial.print(ina.getBusVoltage_V()); Serial.print(" V  I=");
  Serial.print(ina.getCurrent_mA()); Serial.print(" mA  P=");
  Serial.print(ina.getPower_mW()); Serial.println(" mW");
  delay(1000);
}

# INA219 (ESP32) — community starter example
# lib: chrisb2/pyb_ina219 (ina219.py + logging stub on the board)
from machine import Pin, I2C
from ina219 import INA219
import time

i2c = I2C(0, scl=Pin(22), sda=Pin(21))
ina = INA219(0.1, i2c)   # 0.1 ohm shunt
ina.configure()

while True:
    print(ina.voltage(), "V", ina.current(), "mA")
    time.sleep(1)