upm/examples/c/gsr.c

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C
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/*
* 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 "gsr.h"
bool shouldRun = true;
void sig_handler(int signo)
{
if (signo == SIGINT)
shouldRun = false;
}
int main()
{
signal(SIGINT, sig_handler);
//! [Interesting]
// Instantiate a gsr sensor on analog pin A0
gsr_context sensor = gsr_init(0);
if (!sensor)
{
printf("gsr_init() failed.\n");
return -1;
}
// Set the aref, scale, and offset
gsr_set_aref(sensor, 5.0);
gsr_set_scale(sensor, 1.0);
gsr_set_offset(sensor, -.1);
printf("aRef: %0.03f scale: %0.03f offset: %0.03f\n\n",
gsr_get_aref(sensor),
gsr_get_scale(sensor),
gsr_get_offset(sensor));
// Every half a second, sample the sensor output
while (shouldRun)
{
float normalized = 0.0;
float raw_volts = 0.0;
float volts = 0.0;
gsr_get_normalized(sensor, &normalized);
gsr_get_raw_volts(sensor, &raw_volts);
gsr_get_volts(sensor, &volts);
printf("Normalized output: %0.03f, raw gsr sensor output: %0.03f v "
"adjusted output: %0.03f v\n", normalized, raw_volts, volts);
usleep(500000);
}
//! [Interesting]
printf("Exiting\n");
gsr_close(sensor);
return 0;
}