upm/examples/c/dfrorp.c

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2016 Intel Corporation.
 *
 * This program and the accompanying materials are made available under the
 * terms of the The MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 */

#include <unistd.h>
#include <signal.h>

#include "dfrorp.h"
#include "upm_utilities.h"

bool shouldRun = true;

void sig_handler(int signo)
{
  if (signo == SIGINT)
    shouldRun = false;
}

int main()
{
    signal(SIGINT, sig_handler);

    //! [Interesting]

    // Instantiate a DFRobot ORP sensor on analog pin A0 with an analog
    // reference voltage of 5.0.
    dfrorp_context sensor = dfrorp_init(0, 5.0);

    if (!sensor)
    {
        printf("dfrorp_init() failed.\n");
        return(1);
    }

    // To calibrate:
    //
    // Disconnect the sensor probe (but leave the sensor interface board
    // connected).  Then run one of the examples while holding down the
    // 'calibrate' button on the device.  Read the ORP value reported
    // (it should be fairly small).
    //
    // This value is what you should supply to
    // dfrorp_set_orp_cal_offset().  Then reconnect the probe to the
    // interface board and you should be ready to go.
    //
    // DO NOT press the calibrate button on the interface board while
    // the probe is attached or you can permanently damage the probe.
    dfrorp_set_calibration_offset(sensor, 0.97);

    // Every second, update and print values
    while (shouldRun)
    {
        dfrorp_update(sensor);

        printf("ORP = %f mV\n", dfrorp_get_orp(sensor));

        upm_delay(1);
    }

    //! [Interesting]

    printf("Exiting...\n");

    dfrorp_close(sensor);

    return 0;
}