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Tasmota/sonoff/xsns_17_senseair.ino

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/*
xsns_17_senseair.ino - SenseAir CO2 sensor support for Sonoff-Tasmota
Copyright (C) 2018 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_SENSEAIR
/*********************************************************************************************\
* SenseAir K30, K70 and S8 - CO2 sensor
*
* Adapted from EspEasy plugin P052 by Mikael Trieb (mikael__AT__triebconsulting.se)
*
* Hardware Serial will be selected if GPIO1 = [SAir Rx] and GPIO3 = [SAir Tx]
\*********************************************************************************************/
#define XSNS_17 17
#define SENSEAIR_MODBUS_SPEED 9600
#define SENSEAIR_DEVICE_ADDRESS 0xFE // Any address
#define SENSEAIR_READ_REGISTER 0x04 // Command Read
#ifndef CO2_LOW
#define CO2_LOW 800 // Below this CO2 value show green light
#endif
#ifndef CO2_HIGH
#define CO2_HIGH 1200 // Above this CO2 value show red light
#endif
#include <TasmotaModbus.h>
TasmotaModbus *SenseairModbus;
const char kSenseairTypes[] PROGMEM = "Kx0|S8";
uint8_t senseair_type = 1;
char senseair_types[7];
uint16_t senseair_co2 = 0;
float senseair_temperature = 0;
float senseair_humidity = 0;
//uint8_t senseair_state = 0;
const uint8_t start_addresses[] { 0x1A, 0x00, 0x03, 0x04, 0x05, 0x1C, 0x0A };
uint8_t senseair_read_state = 0;
uint8_t senseair_send_retry = 0;
void Senseair250ms() // Every 250 mSec
{
// senseair_state++;
// if (6 == senseair_state) { // Every 300 mSec
// senseair_state = 0;
uint16_t value = 0;
bool data_ready = SenseairModbus->ReceiveReady();
if (data_ready) {
uint8_t error = SenseairModbus->Receive16BitRegister(&value);
if (error) {
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SenseAir response error %d"), error);
AddLog(LOG_LEVEL_DEBUG);
} else {
switch(senseair_read_state) {
case 0: // 0x1A (26) READ_TYPE_LOW - S8: fe 04 02 01 77 ec 92
senseair_type = 2;
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SenseAir type id low %04X"), value);
AddLog(LOG_LEVEL_DEBUG);
break;
case 1: // 0x00 (0) READ_ERRORLOG - fe 04 02 00 00 ad 24
if (value) {
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SenseAir error %04X"), value);
AddLog(LOG_LEVEL_DEBUG);
}
break;
case 2: // 0x03 (3) READ_CO2 - fe 04 02 06 2c af 59
senseair_co2 = value;
LightSetSignal(CO2_LOW, CO2_HIGH, senseair_co2);
break;
case 3: // 0x04 (4) READ_TEMPERATURE - S8: fe 84 02 f2 f1 - Illegal Data Address
senseair_temperature = ConvertTemp((float)value / 100);
break;
case 4: // 0x05 (5) READ_HUMIDITY - S8: fe 84 02 f2 f1 - Illegal Data Address
senseair_humidity = (float)value / 100;
break;
case 5: // 0x1C (28) READ_RELAY_STATE - S8: fe 04 02 01 54 ad 4b - firmware version
{
bool relay_state = value >> 8 & 1;
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SenseAir relay state %d"), relay_state);
AddLog(LOG_LEVEL_DEBUG);
break;
}
case 6: // 0x0A (10) READ_TEMP_ADJUSTMENT - S8: fe 84 02 f2 f1 - Illegal Data Address
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SenseAir temp adjustment %d"), value);
AddLog(LOG_LEVEL_DEBUG);
break;
}
}
senseair_read_state++;
if (2 == senseair_type) { // S8
if (3 == senseair_read_state) {
senseair_read_state = 1;
}
} else { // K30, K70
if (sizeof(start_addresses) == senseair_read_state) {
senseair_read_state = 1;
}
}
}
if (0 == senseair_send_retry || data_ready) {
senseair_send_retry = 5;
SenseairModbus->Send(SENSEAIR_DEVICE_ADDRESS, SENSEAIR_READ_REGISTER, (uint16_t)start_addresses[senseair_read_state], 1);
} else {
senseair_send_retry--;
}
// }
}
/*********************************************************************************************/
void SenseairInit()
{
senseair_type = 0;
if ((pin[GPIO_SAIR_RX] < 99) && (pin[GPIO_SAIR_TX] < 99)) {
SenseairModbus = new TasmotaModbus(pin[GPIO_SAIR_RX], pin[GPIO_SAIR_TX]);
uint8_t result = SenseairModbus->Begin(SENSEAIR_MODBUS_SPEED);
if (result) {
if (2 == result) { ClaimSerial(); }
senseair_type = 1;
}
}
}
void SenseairShow(boolean json)
{
char temperature[10];
char humidity[10];
dtostrfd(senseair_temperature, Settings.flag2.temperature_resolution, temperature);
dtostrfd(senseair_humidity, Settings.flag2.temperature_resolution, humidity);
GetTextIndexed(senseair_types, sizeof(senseair_types), senseair_type -1, kSenseairTypes);
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"%s\":{\"" D_JSON_CO2 "\":%d"), mqtt_data, senseair_types, senseair_co2);
if (senseair_type != 2) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_HUMIDITY "\":%s"), mqtt_data, temperature, humidity);
}
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s}"), mqtt_data);
#ifdef USE_DOMOTICZ
if (0 == tele_period) DomoticzSensor(DZ_AIRQUALITY, senseair_co2);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2, mqtt_data, senseair_types, senseair_co2);
if (senseair_type != 2) {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, senseair_types, temperature, TempUnit());
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, senseair_types, humidity);
}
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
boolean Xsns17(byte function)
{
boolean result = false;
if (senseair_type) {
switch (function) {
case FUNC_INIT:
SenseairInit();
break;
case FUNC_EVERY_250_MSECOND:
Senseair250ms();
break;
case FUNC_JSON_APPEND:
SenseairShow(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
SenseairShow(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_SENSEAIR
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