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

Description

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:

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

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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).

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Pinout:

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

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How It Works:

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

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Applications:

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

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Getting Started (Example with Arduino):

1. Connect the module to your microcontroller:
   • VCC → 3.3V/5V
   • GND → GND
   • SCL → I2C Clock
   • SDA → I2C Data
2. Install the Adafruit INA219 library in the Arduino IDE.
3. Use the following sample code:

   #include <Wire.h>
   #include <Adafruit_INA219.h>
   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);
   }