mirror of https://github.com/arendst/Tasmota.git
137 lines
3.7 KiB
C++
137 lines
3.7 KiB
C++
/*
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xsns_31_ccs811.ino - CCS811 gas and air quality sensor support for Tasmota
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Copyright (C) 2021 Gerhard Mutz and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_CCS811
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/*********************************************************************************************\
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* CCS811 - Gas (TVOC - Total Volatile Organic Compounds) and Air Quality (CO2)
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*
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* Source: Adafruit
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*
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* I2C Address: 0x5A assumes ADDR connected to Gnd, Wake also must be grounded
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\*********************************************************************************************/
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#define XSNS_31 31
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#define XI2C_24 24 // See I2CDEVICES.md
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#define EVERYNSECONDS 5
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#include "Adafruit_CCS811.h"
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Adafruit_CCS811 ccs;
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uint8_t CCS811_ready = 0;
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uint8_t CCS811_type = 0;;
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uint16_t eCO2;
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uint16_t TVOC;
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uint8_t tcnt = 0;
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uint8_t ecnt = 0;
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/********************************************************************************************/
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void CCS811Detect(void)
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{
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if (!I2cSetDevice(CCS811_ADDRESS)) { return; }
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if (!ccs.begin(CCS811_ADDRESS)) {
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CCS811_type = 1;
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I2cSetActiveFound(CCS811_ADDRESS, "CCS811");
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}
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}
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void CCS811Update(void) // Perform every n second
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{
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tcnt++;
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if (tcnt >= EVERYNSECONDS) {
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tcnt = 0;
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CCS811_ready = 0;
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if (ccs.available()) {
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if (!ccs.readData()){
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TVOC = ccs.getTVOC();
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eCO2 = ccs.geteCO2();
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CCS811_ready = 1;
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if (TasmotaGlobal.global_update && (TasmotaGlobal.humidity > 0) && !isnan(TasmotaGlobal.temperature_celsius)) {
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ccs.setEnvironmentalData((uint8_t)TasmotaGlobal.humidity, TasmotaGlobal.temperature_celsius);
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}
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ecnt = 0;
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}
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} else {
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// failed, count up
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ecnt++;
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if (ecnt > 6) {
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// after 30 seconds, restart
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ccs.begin(CCS811_ADDRESS);
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}
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}
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}
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}
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const char HTTP_SNS_CCS811[] PROGMEM =
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"{s}CCS811 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}" // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
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"{s}CCS811 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
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void CCS811Show(bool json)
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{
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if (CCS811_ready) {
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if (json) {
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ResponseAppend_P(PSTR(",\"CCS811\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d}"), eCO2,TVOC);
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#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) DomoticzSensor(DZ_AIRQUALITY, eCO2);
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_CCS811, eCO2, TVOC);
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#endif
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns31(uint32_t function)
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{
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if (!I2cEnabled(XI2C_24)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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CCS811Detect();
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}
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else if (CCS811_type) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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CCS811Update();
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break;
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case FUNC_JSON_APPEND:
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CCS811Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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CCS811Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_CCS811
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#endif // USE_I2C
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