Tasmota/sonoff/xsns_20_novasds.ino

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/*
xsns_20_novasds.ino - Nova SDS011/SDS021 particle concentration 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_NOVA_SDS
/*********************************************************************************************\
* Nova Fitness SDS011 (and possibly SDS021) particle concentration sensor
* For background information see http://aqicn.org/sensor/sds011/
*
* Hardware Serial will be selected if GPIO3 = [SDS0X01]
\*********************************************************************************************/
#include <TasmotaSerial.h>
TasmotaSerial *NovaSdsSerial;
uint8_t novasds_type = 1;
uint8_t novasds_valid = 0;
struct sds011data {
uint16_t pm100;
uint16_t pm25;
} novasds_data;
bool NovaSdsReadData()
{
if (! NovaSdsSerial->available()) return false;
while ((NovaSdsSerial->peek() != 0xAA) && NovaSdsSerial->available()) {
NovaSdsSerial->read();
}
byte d[8] = { 0 };
NovaSdsSerial->read(); // skip 0xAA
NovaSdsSerial->readBytes(d, 8);
NovaSdsSerial->flush();
AddLogSerial(LOG_LEVEL_DEBUG_MORE, d, 8);
if (d[7] == ((d[1] + d[2] + d[3] + d[4] + d[5] + d[6]) & 0xFF)) {
novasds_data.pm25 = (d[1] + 256 * d[2]);
novasds_data.pm100 = (d[3] + 256 * d[4]);
} else {
AddLog_P(LOG_LEVEL_DEBUG, PSTR("SDS: " D_CHECKSUM_FAILURE));
return false;
}
novasds_valid = 10;
return true;
}
/*********************************************************************************************/
void NovaSdsSecond() // Every second
{
if (NovaSdsReadData()) {
novasds_valid = 10;
} else {
if (novasds_valid) {
novasds_valid--;
}
}
}
/*********************************************************************************************/
void NovaSdsInit()
{
novasds_type = 0;
if (pin[GPIO_SDS0X1] < 99) {
NovaSdsSerial = new TasmotaSerial(pin[GPIO_SDS0X1], -1, 1);
if (NovaSdsSerial->begin(9600)) {
if (NovaSdsSerial->hardwareSerial()) { ClaimSerial(); }
novasds_type = 1;
}
}
}
#ifdef USE_WEBSERVER
const char HTTP_SDS0X1_SNS[] PROGMEM = "%s"
"{s}SDS0X1 " D_ENVIRONMENTAL_CONCENTRATION " 2.5 " D_UNIT_MICROMETER "{m}%s " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"
"{s}SDS0X1 " D_ENVIRONMENTAL_CONCENTRATION " 10 " D_UNIT_MICROMETER "{m}%s " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
#endif // USE_WEBSERVER
void NovaSdsShow(boolean json)
{
if (novasds_valid) {
char pm10[10];
char pm2_5[10];
float pm10f = (float)(novasds_data.pm100) / 10.0f;
float pm2_5f = (float)(novasds_data.pm25) / 10.0f;
dtostrfd(pm10f, 1, pm10);
dtostrfd(pm2_5f, 1, pm2_5);
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"SDS0X1\":{\"PM2.5\":%s,\"PM10\":%s}"), mqtt_data, pm2_5, pm10);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_VOLTAGE, pm2_5); // PM2.5
DomoticzSensor(DZ_CURRENT, pm10); // PM10
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SDS0X1_SNS, mqtt_data, pm2_5, pm10);
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
#define XSNS_20
boolean Xsns20(byte function)
{
boolean result = false;
if (novasds_type) {
switch (function) {
case FUNC_INIT:
NovaSdsInit();
break;
case FUNC_EVERY_SECOND:
NovaSdsSecond();
break;
case FUNC_JSON_APPEND:
NovaSdsShow(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
NovaSdsShow(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_NOVA_SDS