Tasmota/sonoff/xsns_21_sgp30.ino

113 lines
3.5 KiB
C++

/*
xsns_21_sgp30.ino - SGP30 gas and air quality sensor support for Sonoff-Tasmota
Copyright (C) 2019 Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_SGP30
/*********************************************************************************************\
* SGP30 - Gas (TVOC - Total Volatile Organic Compounds) and Air Quality (CO2)
*
* Source: Gerhard Mutz and Adafruit Industries
*
* I2C Address: 0x58
\*********************************************************************************************/
#define XSNS_21 21
#include "Adafruit_SGP30.h"
Adafruit_SGP30 sgp;
uint8_t sgp30_type = 0;
uint8_t sgp30_ready = 0;
uint8_t sgp30_counter = 0;
/********************************************************************************************/
void Sgp30Update(void) // Perform every second to ensure proper operation of the baseline compensation algorithm
{
sgp30_ready = 0;
if (!sgp30_type) {
if (sgp.begin()) {
sgp30_type = 1;
// AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SGP: Serialnumber 0x%04X-0x%04X-0x%04X"), sgp.serialnumber[0], sgp.serialnumber[1], sgp.serialnumber[2]);
AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "SGP30", 0x58);
}
} else {
if (!sgp.IAQmeasure()) return; // Measurement failed
sgp30_counter++;
if (30 == sgp30_counter) {
sgp30_counter = 0;
uint16_t TVOC_base;
uint16_t eCO2_base;
if (!sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) return; // Failed to get baseline readings
// AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SGP: Baseline values eCO2 0x%04X, TVOC 0x%04X"), eCO2_base, TVOC_base);
}
sgp30_ready = 1;
}
}
const char HTTP_SNS_SGP30[] PROGMEM = "%s"
"{s}SGP30 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}" // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
"{s}SGP30 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
void Sgp30Show(bool json)
{
if (sgp30_ready) {
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"SGP30\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d}"), mqtt_data, sgp.eCO2, sgp.TVOC);
#ifdef USE_DOMOTICZ
if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, sgp.eCO2);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SGP30, mqtt_data, sgp.eCO2, sgp.TVOC);
#endif
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns21(uint8_t function)
{
bool result = false;
if (i2c_flg) {
switch (function) {
case FUNC_EVERY_SECOND:
Sgp30Update();
break;
case FUNC_JSON_APPEND:
Sgp30Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
Sgp30Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_SGP30
#endif // USE_I2C