MCU-219 INA219 I2C Bi-directional Current / Power Monitoring Sensor Module COM51

The MCU-219 (INA219) is a precision, bidirectional, I2C-based current, voltage, and power monitoring sensor module. It is often used in embedded systems and IoT projects to measure the power consumption of devices.

Key Features:

Voltage Measurement: Measures voltage directly from the device under test.
Current Measurement: Measures current using a shunt resistor.
Power Measurement: Calculates power based on the measured voltage and current.
Bi-Directional Capability: Can measure current in both directions, useful for charging/discharging applications.
I2C Communication: Interfaces with microcontrollers like Arduino, ESP32, or Raspberry Pi over I2C.
High Accuracy: Provides 12-bit resolution for voltage and current measurements.

Specifications:

Operating Voltage: 3.0V to 5.5V (logic level compatible with most microcontrollers).
Current Range: Typically up to ±3.2A (depends on the shunt resistor used).
Voltage Range: 0V to 26V (maximum bus voltage).
Resolution: 12-bit ADC resolution for both voltage and current.
I2C Address: Default 0x40 (can be changed to one of four addresses).
Shunt Resistor: Typically 0.1Ω (may vary depending on the module).

Pinout:

VCC: Power supply (3.3V or 5V).
GND: Ground.
SCL: I2C Clock.
SDA: I2C Data.

How It Works:

The INA219 measures the voltage drop across a precision shunt resistor connected in series with the load.
Using Ohm’s law (V=IRV = IRV=IR), it calculates the current through the load.
It then calculates the power (P=IVP = IVP=IV) being consumed by the load.
The measurements are accessed via the I2C interface.

Applications:

Power monitoring for battery-powered devices.
Solar power systems.
DC motor control.
Energy management in IoT projects.

Getting Started (Example with Arduino):

Connect the module to your microcontroller:

VCC → 3.3V/5V
GND → GND
SCL → I2C Clock
SDA → I2C Data

Install the Adafruit INA219 library in the Arduino IDE.

Use the following sample code:#include 
#include 
Adafruit_INA219 ina219;
void setup() {
Serial.begin(115200);
if (!ina219.begin()) {
Serial.println("Failed to find INA219 chip");
while (1) { delay(10);
}
}
Serial.println("INA219 Initialized.");
}
void loop() {
float shuntvoltage = ina219.getShuntVoltage_mV();
float busvoltage = ina219.getBusVoltage_V();
float current_mA = ina219.getCurrent_mA();
float power_mW = ina219.getPower_mW();
Serial.print("Bus Voltage: ");
Serial.print(busvoltage);
Serial.println(" V");
Serial.print("Shunt Voltage: ");
Serial.print(shuntvoltage);
Serial.println(" mV");
Serial.print("Current: ");
Serial.print(current_mA);
Serial.println(" mA");
Serial.print("Power: ");
Serial.print(power_mW);
Serial.println(" mW");
Serial.println("");
delay(1000);

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