UV

UV

HAL Example

Device Compatibility

Overview

The UV sensor reports values for:

  • UV Index scale used in the United States, conforms with international guidelines for UVI reporting established by the World Health Organization. From UV Index Scale

Code Example

Below is an example of how to interface with the UV sensor in MATRIX HAL.

UV sensor function references can be found here.

The following section shows how to receive data from the UV sensor. You can download this example here.

The command below will compile the example. Be sure to pass in your C++ file and desired output file.

g++ -o YOUR_OUTPUT_FILE YOUR_CPP_FILE -std=c++11 -lmatrix_creator_hal
Include Statements

To begin working with the UV sensor you need to include these header files.

// System calls
#include <unistd.h>
// Input/output streams and functions
#include <iostream>

// Interfaces with UV sensor
#include "matrix_hal/uv_sensor.h"
// Holds data from UV sensor
#include "matrix_hal/uv_data.h"
// Communicates with MATRIX device
#include "matrix_hal/matrixio_bus.h"
Initial Setup

You'll then need to setup MatrixIOBus in order to communicate with the hardware on your MATRIX device.

int main() {
// Create MatrixIOBus object for hardware communication
matrix_hal::MatrixIOBus bus;
// Initialize bus and exit program if error occurs
if (!bus.Init()) return false;
Main Setup

Now we will create our UVData and UVSensor object and use it to receive data from the UV sensor.

// The following code is part of main()

// Create UVData object
matrix_hal::UVData uv_data;
// Create UVSensor object
matrix_hal::UVSensor uv_sensor;
// Set uv_sensor to use MatrixIOBus bus
uv_sensor.Setup(&bus);

// Endless loop
while (true) {
    // Overwrites UVData object with new data
    uv_sensor.Read(&uv_data);
    // UV output is represented in UV Index
    float UV = uv_data.uv;
    // Clear console
    std::system("clear");
    // Output sensor data to console
    std::cout << " [ UV Sensor Output ]" << std::endl;
    std::cout << " [ UV : " << UV << " ]" << std::endl;

    // Sleep for 20000 microseconds
    usleep(20000);
}

return 0;
}

Contents