Tasmota/tasmota/xsns_31_ccs811.ino

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/*
xsns_31_ccs811.ino - CCS811 gas and air quality sensor support for Tasmota
2019-12-31 13:23:34 +00:00
Copyright (C) 2020 Gerhard Mutz and 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_CCS811
/*********************************************************************************************\
* CCS811 - Gas (TVOC - Total Volatile Organic Compounds) and Air Quality (CO2)
*
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* Source: Adafruit
*
* I2C Address: 0x5A assumes ADDR connected to Gnd, Wake also must be grounded
\*********************************************************************************************/
#define XSNS_31 31
#define XI2C_24 24 // See I2CDEVICES.md
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#define EVERYNSECONDS 5
#include "Adafruit_CCS811.h"
Adafruit_CCS811 ccs;
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uint8_t CCS811_ready = 0;
uint8_t CCS811_type = 0;;
uint16_t eCO2;
uint16_t TVOC;
uint8_t tcnt = 0;
uint8_t ecnt = 0;
/********************************************************************************************/
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void CCS811Detect(void)
{
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if (I2cActive(CCS811_ADDRESS)) { return; }
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if (!ccs.begin(CCS811_ADDRESS)) {
CCS811_type = 1;
I2cSetActiveFound(CCS811_ADDRESS, "CCS811");
}
}
void CCS811Update(void) // Perform every n second
{
tcnt++;
if (tcnt >= EVERYNSECONDS) {
tcnt = 0;
CCS811_ready = 0;
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if (ccs.available()) {
if (!ccs.readData()){
TVOC = ccs.getTVOC();
eCO2 = ccs.geteCO2();
CCS811_ready = 1;
if (global_update && (global_humidity > 0) && !isnan(global_temperature)) {
ccs.setEnvironmentalData((uint8_t)global_humidity, global_temperature);
}
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ecnt = 0;
}
} else {
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// failed, count up
ecnt++;
if (ecnt > 6) {
// after 30 seconds, restart
ccs.begin(CCS811_ADDRESS);
}
}
}
}
const char HTTP_SNS_CCS811[] PROGMEM =
"{s}CCS811 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}" // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
"{s}CCS811 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
void CCS811Show(bool json)
{
if (CCS811_ready) {
if (json) {
ResponseAppend_P(PSTR(",\"CCS811\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d}"), eCO2,TVOC);
#ifdef USE_DOMOTICZ
if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, eCO2);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
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} else {
WSContentSend_PD(HTTP_SNS_CCS811, eCO2, TVOC);
#endif
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns31(uint8_t function)
{
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if (!I2cEnabled(XI2C_24)) { return false; }
bool result = false;
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if (FUNC_INIT == function) {
CCS811Detect();
}
else if (CCS811_type) {
switch (function) {
case FUNC_EVERY_SECOND:
CCS811Update();
break;
case FUNC_JSON_APPEND:
CCS811Show(1);
break;
#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
CCS811Show(0);
break;
#endif // USE_WEBSERVER
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}
}
return result;
}
#endif // USE_CCS811
#endif // USE_I2C