Tasmota/sonoff/xsns_31_ccs811.ino

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/*
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xsns_31_ccs811.ino - CCS811 gas and air quality sensor support for Sonoff-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)
*
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* Source: Adafruit
*
* I2C Address: 0x5A assumes ADDR connected to Gnd, Wake also must be grounded
\*********************************************************************************************/
#define XSNS_31 31
#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
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void CCS811Update(void) // Perform every n second
{
tcnt++;
if (tcnt >= EVERYNSECONDS) {
tcnt = 0;
CCS811_ready = 0;
if (!CCS811_type) {
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sint8_t res = ccs.begin(CCS811_ADDRESS);
if (!res) {
CCS811_type = 1;
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "CCS811", 0x5A);
AddLog(LOG_LEVEL_DEBUG);
} else {
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//snprintf_P(log_data, sizeof(log_data), "CCS811 init failed: %d",res);
//AddLog(LOG_LEVEL_DEBUG);
}
} else {
if (ccs.available()) {
if (!ccs.readData()){
TVOC = ccs.getTVOC();
eCO2 = ccs.geteCO2();
CCS811_ready = 1;
if (global_update) { 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"
"{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(boolean json)
{
if (CCS811_ready) {
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"CCS811\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d}"), mqtt_data,eCO2,TVOC);
#ifdef USE_DOMOTICZ
if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, eCO2);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
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} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CCS811, mqtt_data, eCO2, TVOC);
#endif
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
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boolean Xsns31(byte function)
{
boolean 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_APPEND:
CCS811Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_CCS811
#endif // USE_I2C