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air_quality_demo.c
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air_quality_demo.c
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/*
* Copyright (c) 2017-2018, Sensirion AG
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Sensirion AG nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This is based on the example usage for the SPS30 from it's library
* - https://github.com/Sensirion/embedded-sps
*
* as well as the Sensirion ESS library
* - https://github.com/winkj/wiced-ess
*/
#include "wiced.h"
#include "http_client.h"
#include "sensirion_ess.h"
#include "sps30.h"
#include "sensirion_common_wiced.h"
#define DELAY_TIME 500
// Use this define to enable data upload
#define ENABLE_DATA_UPLOAD
#include "http_send_message.h"
void application_start( )
{
// ESS
u16 tvoc_ppb, co2_eq_ppm;
s32 temperature, humidity;
// SPS30
struct sps30_measurement m;
u8 auto_clean_days = 4;
u16 data_ready;
s16 ret;
#ifdef ENABLE_DATA_UPLOAD
int count = 0;
wiced_result_t networkUp;
#endif /* ENABLE_DATA_UPLOAD */
wiced_init();
WPRINT_APP_INFO(("Air Quality Demo\n"));
#ifdef ENABLE_DATA_UPLOAD
networkUp = init_http();
#endif /* ENABLE_DATA_UPLOAD */
// adapt the following lines to your hardware configuration
const ess_device_config_t device_config = {
.i2c_port = WICED_I2C_1,
.needs_init_workaround = 0,
.leds_supported = 0,
.flags = I2C_DEVICE_NO_DMA
};
// -- device probing
while (ess_init(&device_config) != WICED_SUCCESS) {
WPRINT_APP_INFO(("ESS probing failed\n"));
wiced_rtos_delay_milliseconds(DELAY_TIME);
}
while (sps30_probe() != 0) {
WPRINT_APP_INFO(("SPS sensor probing failed\n"));
wiced_rtos_delay_milliseconds(DELAY_TIME);
}
WPRINT_APP_INFO(("SPS sensor probing successful\n"));
// -- setup SPS30 sensor
ret = sps30_set_fan_auto_cleaning_interval_days(auto_clean_days);
if (ret)
WPRINT_APP_INFO(("error %d setting the auto-clean interval\n", ret));
ret = sps30_start_measurement();
if (ret < 0)
WPRINT_APP_INFO(("error starting measurement\n"));
WPRINT_APP_INFO(("measurements started\n"));
wiced_rtos_delay_milliseconds(DELAY_TIME);
// -- main loop
// -- read SGP30, connected to the ESS (environmental sensor shield)
while (1) {
wiced_result_t ret = ess_measure_iaq(&tvoc_ppb, &co2_eq_ppm);
if (ret == WICED_SUCCESS) {
WPRINT_APP_INFO(("tVOC %4u | CO2eq %4u | ", tvoc_ppb, co2_eq_ppm));
} else {
WPRINT_APP_INFO(("error reading IAQ values\n"));
}
// -- read SHTC1, connected to the ESS (environmental sensor shield)
ret = ess_measure_rht(&temperature, &humidity);
if (ret == WICED_SUCCESS) {
WPRINT_APP_INFO(("T %2.2f | RH %2.2f\n", temperature / 1000.0f, humidity / 1000.0f));
} else {
WPRINT_APP_INFO(("error reading RH/T values\n"));
}
// -- check for data ready flag on SPS30
ret = sps30_read_data_ready(&data_ready);
if (ret < 0) {
WPRINT_APP_INFO(("error %d reading data-ready flag\n", ret));
}
if (data_ready) {
// -- read out SPS30
ret = sps30_read_measurement(&m);
if (ret < 0) {
WPRINT_APP_INFO(("error reading measurement\n"));
} else {
WPRINT_APP_INFO(("measured values:\n"
"\t%0.2f pm1.0\n"
"\t%0.2f pm2.5\n"
"\t%0.2f pm4.0\n"
"\t%0.2f pm10.0\n"
"\t%0.2f nc0.5\n"
"\t%0.2f nc1.0\n"
"\t%0.2f nc2.5\n"
"\t%0.2f nc4.5\n"
"\t%0.2f nc10.0\n"
"\t%0.2f typical particle size\n\n",
m.mc_1p0, m.mc_2p5, m.mc_4p0, m.mc_10p0,
m.nc_0p5, m.nc_1p0, m.nc_2p5, m.nc_4p0, m.nc_10p0,
m.typical_particle_size));
}
}
#ifdef ENABLE_DATA_UPLOAD
// -- send data to cloud dashboard
if (networkUp == WICED_SUCCESS) {
if (count % 2 == 0) { // <-- rate limit
send_message_http(temperature / 1000.0f, humidity / 1000.0f, tvoc_ppb, co2_eq_ppm,
m.mc_1p0, m.mc_2p5-m.mc_1p0, m.mc_4p0-m.mc_2p5, m.mc_10p0-m.mc_4p0);
}
count++;
}
#endif /* ENABLE_DATA_UPLOAD */
// Important: for accurate gas measurements on the SGP30, it is important
// to maintain a 1 Hz readout cycle. To ensure this, the following things should be done:
// 1. perform the http upload in a separate thread, to avoid going over the 1s
// 2. measure the duration of the measurement, and only sleep for the delta of 1s-duration
// 3. Potentially move application code unrelated to the SPS30 to another thread
//
// For the sake of simplicity, the author opted for a simple 1s delay here instead,
// potentially sacrificing a little bit of accuracy
wiced_rtos_delay_milliseconds(DELAY_TIME);
}
}