upm/examples/c/dfrorp.c

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2016 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#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;
}