INA219 Class C++ Library

This repository contains a C++ library for the INA219 current sensor. It also includes an example usage code that demonstrates how to use the library to read voltage, current, and power.

Getting Started

Prerequisites

To use this library, you need a Raspberry Pi Pico board, and an INA219 sensor. You also need to install the Pico SDK and add it to your system path.

Wiring

Follow the wiring diagram above to connect the INA219 sensor to the Raspberry Pi Pico board.

Installation

1. Clone this repository to your Raspberry Pi Pico board.
2. Copy the INA219_driver folder to your project folder.
3. Copy the INA219.h header file to your project folder.
4. Copy the example code below to your project file.

#include <stdio.h>
#include "pico/stdlib.h"
#include "INA219_driver/INA219.h"

int main() {
    //i2c bus, i2c address
    INA219 ina219(i2c0, 0x40);
    //SDA pin 8, SCL pin 9, 400 kHz speed
    ina219.I2C_START(8, 9, 400);
    // Calibrate for 0.1 Ohm shunt resistor and 3.2A max expected current
    ina219.calibrate(0.1, 3.2);

    while (1) {
        float voltage = ina219.read_voltage();
        float shunt_voltage = ina219.read_shunt_voltage();
        float current = ina219.read_current();
        float power = ina219.read_power();

        printf("Voltage: %.4f V\n", voltage);
        printf("Shunt Voltage: %.4f mV\n", shunt_voltage);
        printf("Current: %.4f A\n", current);
        printf("Power: %.4f W\n", power);
        printf("--------------------\n");

        sleep_ms(1000);
    }
}

Contributing

If you find a bug or have an idea for a new feature, please create an issue in the GitHub repository. We welcome pull requests for bug fixes and new features.