mirror of https://github.com/arendst/Tasmota.git
Update xsns_21_sgp30.ino
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gemu2015
parent
55ec55c8c9
commit
1ff821d886
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@ -34,65 +34,130 @@ Adafruit_SGP30 sgp;
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uint8_t sgp30_type = 0;
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uint8_t sgp30_ready = 0;
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uint8_t sgp30_counter = 0;
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float sgp30_abshum;
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/********************************************************************************************/
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void sgp30_Init(void) {
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if (sgp.begin()) {
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sgp30_type = 1;
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// snprintf_P(log_data, sizeof(log_data), PSTR("SGP: Serialnumber 0x%04X-0x%04X-0x%04X"), sgp.serialnumber[0], sgp.serialnumber[1], sgp.serialnumber[2]);
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// AddLog(LOG_LEVEL_DEBUG);
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snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "SGP30", 0x58);
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AddLog(LOG_LEVEL_DEBUG);
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}
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}
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float sgp30_AbsoluteHumidity(float temperature, float humidity,char tempUnit) {
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//taken from https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
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//precision is about 0.1°C in range -30 to 35°C
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//August-Roche-Magnus 6.1094 exp(17.625 x T)/(T + 243.04)
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//Buck (1981) 6.1121 exp(17.502 x T)/(T + 240.97)
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//reference https://www.eas.ualberta.ca/jdwilson/EAS372_13/Vomel_CIRES_satvpformulae.html
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float temp = NAN;
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const float mw = 18.01534; // molar mass of water g/mol
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const float r = 8.31447215; // Universal gas constant J/mol/K
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if (isnan(temperature) || isnan(humidity) ) {
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return NAN;
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}
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if (tempUnit != 'C') {
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temperature = (temperature - 32.0) * (5.0 / 9.0); /*conversion to [°C]*/
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}
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temp = pow(2.718281828, (17.67 * temperature) / (temperature + 243.5));
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//return (6.112 * temp * humidity * 2.1674) / (273.15 + temperature); //simplified version
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return (6.112 * temp * humidity * mw) / ((273.15 + temperature) * r); //long version
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}
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#define SAVE_PERIOD 30
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void Sgp30Update(void) // Perform every second to ensure proper operation of the baseline compensation algorithm
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{
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sgp30_ready = 0;
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if (!sgp30_type) {
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if (sgp.begin()) {
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sgp30_type = 1;
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// AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SGP: Serialnumber 0x%04X-0x%04X-0x%04X"), sgp.serialnumber[0], sgp.serialnumber[1], sgp.serialnumber[2]);
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AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "SGP30", 0x58);
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if (!sgp.IAQmeasure() || !sgp30_type) {
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// retry to init every 100 seconds
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if (21 == (uptime %100)) {
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sgp30_Init();
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}
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} else {
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if (!sgp.IAQmeasure()) return; // Measurement failed
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sgp30_counter++;
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if (30 == sgp30_counter) {
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sgp30_counter = 0;
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return; // Measurement failed
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}
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if (global_update) {
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// abs hum in mg/m3
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sgp30_abshum=sgp30_AbsoluteHumidity(global_temperature,global_humidity,TempUnit());
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sgp.setHumidity(sgp30_abshum*1000);
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}
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sgp30_ready = 1;
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uint16_t TVOC_base;
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uint16_t eCO2_base;
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// these should normally be stored permanently and used for fast restart
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if (!(uptime%SAVE_PERIOD)) {
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// store settings every N seconds
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uint16_t TVOC_base;
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uint16_t eCO2_base;
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if (!sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) return; // Failed to get baseline readings
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// snprintf_P(log_data, sizeof(log_data), PSTR("SGP: Baseline values eCO2 0x%04X, TVOC 0x%04X"), eCO2_base, TVOC_base);
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// AddLog(LOG_LEVEL_DEBUG);
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if (!sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) return; // Failed to get baseline readings
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// AddLog_P2(LOG_LEVEL_DEBUG, PSTR("SGP: Baseline values eCO2 0x%04X, TVOC 0x%04X"), eCO2_base, TVOC_base);
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}
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sgp30_ready = 1;
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}
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}
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#ifdef USE_WEBSERVER
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const char HTTP_SNS_SGP30[] PROGMEM =
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"{s}SGP30 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}" // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
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"{s}SGP30 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
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const char HTTP_SNS_AHUM[] PROGMEM = "{s}SGP30 " "Abs Humidity" "{m}%s g/m3{e}";
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#endif
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#define D_JSON_AHUM "aHumidity"
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void Sgp30Show(bool json)
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{
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if (sgp30_ready) {
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char abs_hum[33];
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if (global_update) {
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// has humidity + temperature
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dtostrfd(sgp30_abshum,4,abs_hum);
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}
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if (json) {
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ResponseAppend_P(PSTR(",\"SGP30\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d}"), sgp.eCO2, sgp.TVOC);
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ResponseAppend_P(PSTR(",\"SGP30\":{\"" D_JSON_ECO2 "\":%d,\"" D_JSON_TVOC "\":%d"), sgp.eCO2, sgp.TVOC);
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if (global_update) {
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ResponseAppend_P(PSTR(",\"" D_JSON_AHUM "\":%s"),abs_hum);
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}
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ResponseAppend_P(PSTR("}"));
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#ifdef USE_DOMOTICZ
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if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, sgp.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_SGP30, sgp.eCO2, sgp.TVOC);
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if (global_update) {
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WSContentSend_PD(HTTP_SNS_AHUM, abs_hum);
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}
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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 Xsns21(uint8_t function)
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bool Xsns21(byte function)
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{
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bool result = false;
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if (i2c_flg) {
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switch (function) {
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case FUNC_INIT:
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sgp30_Init();
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break;
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case FUNC_EVERY_SECOND:
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Sgp30Update();
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break;
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@ -110,4 +175,4 @@ bool Xsns21(uint8_t function)
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}
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#endif // USE_SGP30
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#endif // USE_I2C
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#endif // USE_I2C
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