upm/examples/c/o2.c

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/*
* Author: Noel Eck <noel.eck@intel.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 "o2.h"
#include "upm_utilities.h"
#include "mraa.h"
bool shouldRun = true;
void sig_handler(int signo)
{
if (signo == SIGINT)
shouldRun = false;
}
int main()
{
if (mraa_init() != MRAA_SUCCESS)
{
perror("Failed to initialize mraa\n");
return -1;
}
signal(SIGINT, sig_handler);
//! [Interesting]
// Instantiate a o2 sensor on analog pin A0
o2_context sensor = o2_init(0);
if (!sensor)
{
printf("o2_init() failed.\n");
return -1;
}
// Every half a second, sample the sensor output
while (shouldRun)
{
float raw_volts = 0.0;
float o2_percent = 0.0;
o2_get_raw_volts(sensor, &raw_volts);
o2_get_value(sensor, &o2_percent);
printf("O2 raw volts: %0.03f v, o2: %0.03f %%\n",
raw_volts, o2_percent);
upm_delay_ms(500);
}
//! [Interesting]
printf("Exiting\n");
o2_close(sensor);
return 0;
}