Tasmota/tasmota/xsns_31_ccs811.ino

131 lines
3.7 KiB
C++

/*
xsns_31_ccs811.ino - CCS811 gas and air quality sensor support for Tasmota
Copyright (C) 2019 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)
*
* 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
#include "Adafruit_CCS811.h"
Adafruit_CCS811 ccs;
uint8_t CCS811_ready;
uint8_t CCS811_type;
uint16_t eCO2;
uint16_t TVOC;
uint8_t tcnt = 0;
uint8_t ecnt = 0;
/********************************************************************************************/
#define EVERYNSECONDS 5
void CCS811Update(void) // Perform every n second
{
tcnt++;
if (tcnt >= EVERYNSECONDS) {
tcnt = 0;
CCS811_ready = 0;
if (!CCS811_type) {
sint8_t res = ccs.begin(CCS811_ADDRESS);
if (!res) {
CCS811_type = 1;
AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "CCS811", 0x5A);
} else {
//AddLog_P2(LOG_LEVEL_DEBUG, "CCS811 init failed: %d",res);
}
} else {
if (ccs.available()) {
if (!ccs.readData()){
TVOC = ccs.getTVOC();
eCO2 = ccs.geteCO2();
CCS811_ready = 1;
if (global_update && global_humidity>0 && global_temperature!=9999) { ccs.setEnvironmentalData((uint8_t)global_humidity, global_temperature); }
ecnt = 0;
}
} else {
// 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
} else {
WSContentSend_PD(HTTP_SNS_CCS811, eCO2, TVOC);
#endif
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns31(uint8_t function)
{
if (!XI2cEnabled(XI2C_24)) { return false; }
bool result = false;
if (i2c_flg) {
switch (function) {
case FUNC_EVERY_SECOND:
CCS811Update();
break;
case FUNC_JSON_APPEND:
CCS811Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
CCS811Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_CCS811
#endif // USE_I2C