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Tasmota/tasmota/tasmota_xsns_sensor/xsns_42_scd30.ino

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/*
xsns_42_scd30.ino - SC30 CO2 sensor support for Tasmota
Copyright (C) 2021 Frogmore42
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_SCD30
#define XSNS_42 42
#define XI2C_29 29 // See I2CDEVICES.md
//#define SCD30_DEBUG
#define SCD30_ADDRESS 0x61
#define SCD30_MAX_MISSED_READS 3
#define SCD30_STATE_NO_ERROR 0
#define SCD30_STATE_ERROR_DATA_CRC 1
#define SCD30_STATE_ERROR_READ_MEAS 2
#define SCD30_STATE_ERROR_SOFT_RESET 3
#define SCD30_STATE_ERROR_I2C_RESET 4
#define SCD30_STATE_ERROR_UNKNOWN 5
#include "Arduino.h"
#include <FrogmoreScd30.h>
#define D_CMND_SCD30 "SCD30"
const char S_JSON_SCD30_COMMAND_NVALUE[] PROGMEM = "{\"" D_CMND_SCD30 "%s\":%d}";
const char S_JSON_SCD30_COMMAND_NFW_VALUE[] PROGMEM = "{\"" D_CMND_SCD30 "%s\":%d.%d}";
const char S_JSON_SCD30_COMMAND[] PROGMEM = "{\"" D_CMND_SCD30 "%s\"}";
const char kSCD30_Commands[] PROGMEM = "Alt|Auto|Cal|FW|Int|Pres|TOff";
/*********************************************************************************************\
* enumerationsines
\*********************************************************************************************/
enum SCD30_Commands { // commands useable in console or rules
CMND_SCD30_ALTITUDE,
CMND_SCD30_AUTOMODE,
CMND_SCD30_CALIBRATE,
CMND_SCD30_FW,
CMND_SCD30_INTERVAL,
CMND_SCD30_PRESSURE,
CMND_SCD30_TEMPOFFSET
};
FrogmoreScd30 scd30;
bool scd30Found = false;
bool scd30IsDataValid = false;
int scd30ErrorState = SCD30_STATE_NO_ERROR;
uint16_t scd30Interval_sec;
int scd30Loop_count = 0;
int scd30DataNotAvailable_count = 0;
int scd30GoodMeas_count = 0;
int scd30Reset_count = 0;
int scd30CrcError_count = 0;
int scd30Co2Zero_count = 0;
int i2cReset_count = 0;
uint16_t scd30_CO2 = 0;
uint16_t scd30_CO2EAvg = 0;
float scd30_Humid = 0.0f;
float scd30_Temp = 0.0f;
void Scd30Detect(void)
{
if (!I2cSetDevice(SCD30_ADDRESS)) { return; }
scd30.begin();
uint8_t major = 0;
uint8_t minor = 0;
if (scd30.getFirmwareVersion(&major, &minor)) { return; }
uint16_t interval_sec;
if (scd30.getMeasurementInterval(&scd30Interval_sec)) { return; }
if (scd30.beginMeasuring()) { return; }
I2cSetActiveFound(SCD30_ADDRESS, "SCD30");
scd30Found = true;
AddLog(LOG_LEVEL_DEBUG, PSTR("SCD: FW v%d.%d"), major, minor);
}
// gets data from the sensor every 3 seconds or so to give the sensor time to gather new data
void Scd30Update(void)
{
scd30Loop_count++;
if (scd30Loop_count > (scd30Interval_sec - 1)) {
uint32_t error = 0;
switch (scd30ErrorState) {
case SCD30_STATE_NO_ERROR: {
error = scd30.readMeasurement(&scd30_CO2, &scd30_CO2EAvg, &scd30_Temp, &scd30_Humid);
switch (error) {
case ERROR_SCD30_NO_ERROR:
scd30Loop_count = 0;
scd30IsDataValid = true;
scd30GoodMeas_count++;
break;
case ERROR_SCD30_NO_DATA:
scd30DataNotAvailable_count++;
break;
case ERROR_SCD30_CRC_ERROR:
scd30ErrorState = SCD30_STATE_ERROR_DATA_CRC;
scd30CrcError_count++;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: CRC error, CRC error: %ld, CO2 zero: %ld, good: %ld, no data: %ld, sc30_reset: %ld, i2c_reset: %ld"),
scd30CrcError_count, scd30Co2Zero_count, scd30GoodMeas_count, scd30DataNotAvailable_count, scd30Reset_count, i2cReset_count);
#endif
break;
case ERROR_SCD30_CO2_ZERO:
scd30Co2Zero_count++;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: CO2 zero, CRC error: %ld, CO2 zero: %ld, good: %ld, no data: %ld, sc30_reset: %ld, i2c_reset: %ld"),
scd30CrcError_count, scd30Co2Zero_count, scd30GoodMeas_count, scd30DataNotAvailable_count, scd30Reset_count, i2cReset_count);
#endif
break;
default: {
scd30ErrorState = SCD30_STATE_ERROR_READ_MEAS;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: Update: ReadMeasurement error: 0x%lX, counter: %ld"), error, scd30Loop_count);
#endif
return;
}
break;
}
}
break;
case SCD30_STATE_ERROR_DATA_CRC: {
//scd30IsDataValid = false;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
scd30ErrorState, scd30GoodMeas_count, scd30DataNotAvailable_count, scd30Reset_count, i2cReset_count);
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: got CRC error, try again, counter: %ld"), scd30Loop_count);
#endif
scd30ErrorState = ERROR_SCD30_NO_ERROR;
}
break;
case SCD30_STATE_ERROR_READ_MEAS: {
//scd30IsDataValid = false;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
scd30ErrorState, scd30GoodMeas_count, scd30DataNotAvailable_count, scd30Reset_count, i2cReset_count);
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: not answering, sending soft reset, counter: %ld"), scd30Loop_count);
#endif
scd30Reset_count++;
error = scd30.softReset();
if (error) {
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: resetting got error: 0x%lX"), error);
#endif
error >>= 8;
if (error == 4) {
scd30ErrorState = SCD30_STATE_ERROR_SOFT_RESET;
} else {
scd30ErrorState = SCD30_STATE_ERROR_UNKNOWN;
}
} else {
scd30ErrorState = ERROR_SCD30_NO_ERROR;
}
}
break;
case SCD30_STATE_ERROR_SOFT_RESET: {
//scd30IsDataValid = false;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: in error state: %d, good: %ld, no data: %ld, sc30 reset: %ld, i2c reset: %ld"),
scd30ErrorState, scd30GoodMeas_count, scd30DataNotAvailable_count, scd30Reset_count, i2cReset_count);
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: clearing i2c bus"));
#endif
i2cReset_count++;
error = scd30.clearI2CBus();
if (error) {
scd30ErrorState = SCD30_STATE_ERROR_I2C_RESET;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: error clearing i2c bus: 0x%lX"), error);
#endif
} else {
scd30ErrorState = ERROR_SCD30_NO_ERROR;
}
}
break;
default: {
//scd30IsDataValid = false;
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: unknown error state: 0x%lX"), scd30ErrorState);
#endif
scd30ErrorState = SCD30_STATE_ERROR_SOFT_RESET; // try again
}
}
if (scd30Loop_count > (SCD30_MAX_MISSED_READS * scd30Interval_sec)) {
scd30IsDataValid = false;
}
}
}
int Scd30GetCommand(int command_code, uint16_t *pvalue)
{
switch (command_code)
{
case CMND_SCD30_ALTITUDE:
return scd30.getAltitudeCompensation(pvalue);
break;
case CMND_SCD30_AUTOMODE:
return scd30.getCalibrationType(pvalue);
break;
case CMND_SCD30_CALIBRATE:
return scd30.getForcedRecalibrationFactor(pvalue);
break;
case CMND_SCD30_INTERVAL:
return scd30.getMeasurementInterval(pvalue);
break;
case CMND_SCD30_PRESSURE:
return scd30.getAmbientPressure(pvalue);
break;
case CMND_SCD30_TEMPOFFSET:
return scd30.getTemperatureOffset(pvalue);
break;
default:
// else for Unknown command
break;
}
return 0; // Fix GCC 10.1 warning
}
int Scd30SetCommand(int command_code, uint16_t value)
{
switch (command_code)
{
case CMND_SCD30_ALTITUDE:
return scd30.setAltitudeCompensation(value);
break;
case CMND_SCD30_AUTOMODE:
return scd30.setCalibrationType(value);
break;
case CMND_SCD30_CALIBRATE:
return scd30.setForcedRecalibrationFactor(value);
break;
case CMND_SCD30_INTERVAL:
{
int error = scd30.setMeasurementInterval(value);
if (!error)
{
scd30Interval_sec = value;
}
return error;
}
break;
case CMND_SCD30_PRESSURE:
return scd30.setAmbientPressure(value);
break;
case CMND_SCD30_TEMPOFFSET:
return scd30.setTemperatureOffset(value);
break;
default:
// else for Unknown command
break;
}
return 0; // Fix GCC 10.1 warning
}
/*********************************************************************************************\
* Command Sensor42
\*********************************************************************************************/
bool Scd30CommandSensor()
{
char command[CMDSZ];
bool serviced = true;
uint8_t prefix_len = strlen(D_CMND_SCD30);
if (!strncasecmp_P(XdrvMailbox.topic, PSTR(D_CMND_SCD30), prefix_len)) { // prefix
int command_code = GetCommandCode(command, sizeof(command), XdrvMailbox.topic + prefix_len, kSCD30_Commands);
switch (command_code) {
case CMND_SCD30_ALTITUDE:
case CMND_SCD30_AUTOMODE:
case CMND_SCD30_CALIBRATE:
case CMND_SCD30_INTERVAL:
case CMND_SCD30_PRESSURE:
case CMND_SCD30_TEMPOFFSET:
{
uint16_t value = 0;
if (XdrvMailbox.data_len > 0)
{
value = XdrvMailbox.payload;
Scd30SetCommand(command_code, value);
}
else
{
Scd30GetCommand(command_code, &value);
}
Response_P(S_JSON_SCD30_COMMAND_NVALUE, command, value);
}
break;
case CMND_SCD30_FW:
{
uint8_t major = 0;
uint8_t minor = 0;
int error;
error = scd30.getFirmwareVersion(&major, &minor);
if (error)
{
#ifdef SCD30_DEBUG
AddLog(LOG_LEVEL_ERROR, PSTR("SCD30: error getting FW version: 0x%lX"), error);
#endif
serviced = false;
}
else
{
Response_P(S_JSON_SCD30_COMMAND_NFW_VALUE, command, major, minor);
}
}
break;
default:
// else for Unknown command
serviced = false;
break;
}
}
return serviced;
}
void Scd30Show(bool json)
{
if (scd30IsDataValid)
{
float t = ConvertTemp(scd30_Temp);
float h = ConvertHumidity(scd30_Humid);
if (json) {
ResponseAppend_P(PSTR(",\"SCD30\":{\"" D_JSON_CO2 "\":%d,\"" D_JSON_ECO2 "\":%d,"), scd30_CO2, scd30_CO2EAvg);
ResponseAppendTHD(t, h);
ResponseJsonEnd();
#ifdef USE_DOMOTICZ
if (0 == TasmotaGlobal.tele_period) {
DomoticzSensor(DZ_AIRQUALITY, scd30_CO2);
DomoticzTempHumPressureSensor(t, h);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_CO2EAVG, "SCD30", scd30_CO2EAvg);
WSContentSend_PD(HTTP_SNS_CO2, "SCD30", scd30_CO2);
WSContentSend_THD("SCD30", t, h);
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns42(byte function)
{
if (!I2cEnabled(XI2C_29)) { return false; }
bool result = false;
if (FUNC_INIT == function) {
Scd30Detect();
}
else if (scd30Found) {
switch (function) {
case FUNC_EVERY_SECOND:
Scd30Update();
break;
case FUNC_COMMAND:
result = Scd30CommandSensor();
break;
case FUNC_JSON_APPEND:
Scd30Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Scd30Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_SCD30
#endif // USE_I2C
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