include/sensor_ldr.cpp

@@ -1,90 +0,0 @@
-// High/Low Output LDR Sensor
-// For example: RCWL-0516 (needs 5v input (gnd, vin), 3.3v output level. high for 2seconds when movement detected)
-#include "sensor_ldr.h"
-
-
-Sensor_LDR::Sensor_LDR(int p)
-{
-  pin=p;
-  sensordata data;
-}
-
-void Sensor_LDR::init() //Things to be done during setup()
-{    
-  Serial.println("initializing LDR");
-  pinMode(pin, INPUT);
-  analogRead(pin); //first reading could be false
-  init_ok=true;     
-}
-
-//Also called during setup()
-void Sensor_LDR::setSettings(float minchange, unsigned long senddelaymax, unsigned long readdelay)
-{
-    data.minchange=minchange;
-    data.senddelaymax=senddelaymax;
-    data.readdelay=readdelay;
-}
-
-//Called during setup
-void Sensor_LDR::advertise(HomieNode& p_sensorNode)
-{
-    sensorNode = &p_sensorNode;
-    sensorNode->advertise("light");
-    
-}
-
-void Sensor_LDR::sensorloop()
-{
-  if (init_ok) {
-    sensordata &d=data;
-    
-    bool _changed=false;
-    if (millis() >= (d.lastreadtime+d.readdelay)) {
-      d.value = get_lux(in_ldr, out_ldr, LDR_ARRAYSIZE)/10.0; //read light level in lux
-      if (fabs(d.lastsentvalue-d.value)>=d.minchange){
-        _changed=true;
-      }
-      d.lastreadtime=millis();
-    }
-
-    if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
-      Serial.print("Sending LDR. reason=");
-      if (_changed) Serial.println("change"); else Serial.println("time");
-
-      Homie.getLogger() << "light " << ": " << d.value << endl;
-      sensorNode->setProperty("light").send(String(d.value));
-      d.lastsentvalue=d.value;
-      
-      d.lastsent=millis();
-    }
-  }
-}
-
-
-//////////////////////////////////////////////////////////////////////////////
-// Calculate lux based on rawADC reading from LDR returns value in lux/10
-//////////////////////////////////////////////////////////////////////////////
-//quelle: https://groups.google.com/forum/#!topic/souliss/1kMAltPB2ME[1-25]
-int Sensor_LDR::get_lux(const unsigned int* _in, const unsigned int* _out, byte size)
-{
-  // take care the value is within range
-  // val = constrain(val, _in[0], _in[size-1]);
-  unsigned int val = analogRead(pin);
-  #ifdef DEBUG   //DEBUG++++++++++++++++
-        Serial.print("LDR RAW=: ");
-        Serial.println(val);
-  #endif
-
-  if (val <= _in[0]) return _out[0];
-  if (val >= _in[size-1]) return _out[size-1];
-
-  // search right interval
-  byte pos = 1;  // _in[0] allready tested
-  while(val > _in[pos]) pos++;
-
-  // this will handle all exact "points" in the _in array
-  if (val == _in[pos]) return _out[pos];
-
-  // interpolate in the right segment for the rest
-  return map(val, _in[pos-1], _in[pos], _out[pos-1], _out[pos]);
-}

include/sensor_ldr.h

@@ -1,45 +0,0 @@
-#ifndef SENSOR_LDR_H
-#define SENSOR_LDR_H
-
-#include "sensordata.h"
-#include <Homie.h>
-
-
-
-class Sensor_LDR
-{
-    
-private:
-    HomieNode *sensorNode; //reference to HomieNode
-
-    int pin;
-
-    struct sensordata data; //struct values are changed in setup()
-
-    int get_lux(const unsigned int* _in, const unsigned int* _out, byte size);
-
-
-    
-    //wemos d1 mini, black wire of ldr connects to A0 with 10k to gnd. red wire connects with 1k to gnd and 2k2 to 3v3
-    #ifdef SENSOR_LDR_CALIB_1
-    #define LDRARRAYSIZE 18
-    const unsigned int out_ldr[18] = {0, 30, 50,  60,  130, 170, 250, 420, 780, 1300,2600, 5000, 5350, 7700, 10900, 12000, 17000,20000};  // x10  (i.e. gets later divided by 10)
-    const unsigned int in_ldr[18]  = {0, 12, 100, 150, 350, 400, 450, 650, 730,  780, 840, 930,  948 , 970,  993,   1005,  1019, 1023};  // 0 - 1023
-    #endif
-    
-
-    
-    bool init_ok;
-public:
-    Sensor_LDR(int p);
-
-
-    void init();
-    void setSettings(float minchange, unsigned long senddelaymax, unsigned long readdelay);
-    void advertise(HomieNode& p_sensorNode);
-    void sensorloop();
-    
-};
-
-#endif
-

include/sensor_mhz19b.cpp

@@ -1,169 +0,0 @@
-#include "sensor_mhz19b.h"
-
-
-
-Sensor_MHZ19B::Sensor_MHZ19B(int prx,int ptx)
-{
-  pin_rx=prx;
-  pin_tx=ptx;
-
-  /*
-  * MHZ19 Library: https://platformio.org/lib/show/1620/SevSegSPI
-  * Software Serial Library: https://platformio.org/lib/show/168/EspSoftwareSerial
-
-  */
-  // SW Serial
-  //SW Serial RX: to mhz19 tx (green cable)
-  //SW Serial TX: to mhz19 rx (blue cable)
-  //co2 sensor needs 5v. Maybe better to Connect USB 5V directly (not through wemos d1 onboard diode which gives only 4.7V! at '5V' output)
-
-  //if ABC is disabled (see in setup function) sensor should be calibrated manually. leave outdoors (=400ppm) with no direct sunlight for >20min, then connect HD pin to GND for at least 7 seconds.
-  /* Pinout  (view from top, connector at the bottom)
-  * Vin, GND, NC, PWM
-  *  |    |    |    |
-  * /-----------------\
-  * |                 |
-  * |                 |
-  * |                 |
-  * |                 |
-  * \-----------------/
-  *    |  |  |  |  |
-  *   Vo Rx Tx NC HD
-  * 
-  *       [Connector]
-  */
-
-  //value will be in [ppm]
-}
-
-void Sensor_MHZ19B::init() //Things to be done during setup()
-{    
-  Serial.println("initializing MHZ19B");
-  mhz19_swSerial->begin(BAUD_RATE_MHZ19, SWSERIAL_8N1, pin_rx, pin_tx, false, 256);
-  mhz19->setSerial(mhz19_swSerial);
-  
-  uint8_t mhz19abctries=10;
-  while(!mhz19->disableABC() && mhz19abctries>0) { //disable automatic baseline correction (abc does calibration every 24h -> needs to have 400ppm co2 level sometime during that time)
-    delay(500); //wait some time for mhz to be initialized
-    Serial.print("disableABC Failed! try="); Serial.println(mhz19abctries);
-    mhz19abctries--;
-  }
-  if (mhz19abctries>0) {
-    Serial.println("mhz19 abc disabled successfully");
-    init_ok=true;
-  }
-}
-
-//Also called during setup()
-void Sensor_MHZ19B::setSettings(float minchange, unsigned long senddelaymax, unsigned long readdelay)
-{
-    data.minchange=minchange;
-    data.senddelaymax=senddelaymax;
-    data.readdelay=readdelay;
-}
-
-
-bool Sensor_MHZ19B::mhz19calibrationHandler(const HomieRange& range, const String& value) {
-  if (range.isRange) {
-    return false; //if range is given but index is not in allowed range
-  }
-  Homie.getLogger() << "mhz19 calibration " << ": " << value << endl;
-  
-  if (value=="zero") {
-    mhz19->calibrateZero();
-    Homie.getLogger() << "mhz19 calibration " << ": " << value << endl;
-    #ifdef STATUSNODE
-    sensorNode->setProperty("status").send("MHZ19 Zero Calibration triggered");
-    #endif
-  } else {
-    Homie.getLogger() << "Value outside range" << endl;
-    return false;  
-  }
-  
-  return true;
-}
-
-//Called during setup
-void Sensor_MHZ19B::advertise(HomieNode& p_sensorNode)
-{
-    sensorNode = &p_sensorNode;
-    sensorNode->advertise("co2");
-    #ifdef MHZ19CALIBRATIONTOPIC      
-      sensorNode->advertise("mhz19calibration").settable(&Sensor_MHZ19B::mhz19calibrationHandler)); //not working!!! TODO: Fix it
-    #endif
-}
-
-void Sensor_MHZ19B::sensorloop()
-{
-  if (init_ok) {
-    sensordata &d=data;
-    
-    bool _changed=false;
-    if (millis() >= (d.lastreadtime+d.readdelay)) {
-      mhz19_ready=mhz19->isReady();
-      //d.value=mhz19->readValue(); //[ppm]
-      d.value=mhz19_readValue_reimplemented(mhz19_swSerial, mhz19); //[ppm]  reimplemented function to fix no response issue
-      Homie.getLogger() << "read co2 " << ": " << d.value << " status=" << mhz19_ready << endl;
-      if (fabs(d.lastsentvalue-d.value)>=d.minchange){
-        _changed=true;
-      }
-      d.lastreadtime=millis();
-    }
-
-    if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
-      Serial.print("Sending MHZ19. reason=");
-      if (_changed) Serial.println("change"); else Serial.println("time");
-
-      Homie.getLogger() << "co2 " << ": " << d.value << endl;
-      if (mhz19_ready){ //send no co2 values if not warmed up. can take several miniutes
-        sensorNode->setProperty("co2").send(String(d.value));
-      }else{
-        Homie.getLogger() << "co2 not ready. didnt sent" << endl;
-      }
-      
-      d.lastsentvalue=d.value;
-      
-      d.lastsent=millis();
-    }
-  }
-}
-
-
-byte Sensor_MHZ19B::mhz19_getCheckSum(byte* packet) {
-  byte checksum = 0;
-  for(uint8_t i = 1; i < 8; i++) {
-    checksum += packet[i];
-  }
-  checksum = 0xff - checksum;
-  checksum += 1;
-  return checksum;
-}
-
-int Sensor_MHZ19B::mhz19_readValue_reimplemented(Stream *_streamRef, MHZ19 *_mhz19Ref) { //same function as in mhz19 library from klevytskyi, but with delay between cmd send and response check
-  byte CMD_READ[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79}; // Read command
-  unsigned int co2 = -1;
-  unsigned char response[9];
-  _streamRef->write(CMD_READ, 9);
-
-  unsigned long _startwait=millis();
-  while (millis()-_startwait<100) { //wait for mhz19 to send response
-    //wait
-  }
-
-  if (_streamRef->available()) {
-    _streamRef->readBytes(response, 9);
-
-    byte crc = mhz19_getCheckSum(response);
-
-    if (response[0] == 0xFF && response[1] == CMD_READ[2] && response[8] == crc) {
-      unsigned int responseHigh = (unsigned int) response[2];
-      unsigned int responseLow = (unsigned int) response[3];
-      unsigned int ppm = (256*responseHigh) + responseLow;
-      co2 = ppm;
-    }
-  }
-
-  return co2;
-}
-
-

include/sensor_mhz19b.h

@@ -1,52 +0,0 @@
-#ifndef SENSOR_MHZ19B_H
-#define SENSOR_MHZ19B_H
-
-#include "sensordata.h"
-#include <Homie.h>
-
-
-#include <SoftwareSerial.h>
-#include <MHZ19.h>
-
-
-class Sensor_MHZ19B
-{
-    
-private:
-    HomieNode *sensorNode; //reference to HomieNode
-
-    struct sensordata data; //struct values are changed in setup()
-
-    int pin_rx;
-    int pin_tx;
-
-    bool init_ok;
-
-    int mhz19_readValue_reimplemented(Stream *_streamRef, MHZ19 *_mhz19Ref);
-    byte mhz19_getCheckSum(byte* packet);
-    
-
-    bool mhz19_ready;
-
-    MHZ19 *mhz19;
-    SoftwareSerial *mhz19_swSerial;
-    #define BAUD_RATE_MHZ19 9600
-
-    
-
-    //#define MHZ19CALIBRATIONTOPIC  //TODO: fix it
-
-public:
-    Sensor_MHZ19B(int prx, int ptx);
-
-    void init();
-    void setSettings(float minchange, unsigned long senddelaymax, unsigned long readdelay);
-    void advertise(HomieNode& p_sensorNode);
-    void sensorloop();
-
-    bool mhz19calibrationHandler(const HomieRange& range, const String& value);
-    
-};
-
-#endif
-

platformio.ini

@@ -82,6 +82,8 @@ monitor_port = /dev/ttyUSB0
 monitor_speed = 115200
 
 build_flags =
+    -D SENSOR_HCSR501
+    -D SENSOR_HCSR501_PIN=D0
 
 
     -D SENSOR_RADAR
@@ -89,10 +91,6 @@ build_flags =
     -D SENSOR_RADAR_readdelay=100
     -D SENSOR_RADAR_senddelaymax=1000*60*10
 
-    -D SENSOR_LDR
-    -D SENSOR_LDR_PIN=A0
-    -D SENSOR_LDR_CALIB_1
-
 
 lib_deps = 
     ArduinoJson@6.16.1 #dependency of homie. using older version because of "ambiguous overload for operator|" error
@@ -121,10 +119,11 @@ build_flags =
     -D SENSOR_HCSR501_PIN=D6
 
     -D SENSOR_LDR
-    -D SENSOR_LDR_CALIB_1
+    -D SENSOR_LDR_CALIB1
-    -D SENSOR_LDR_PIN=A0
+    -D LDR_PIN=A0
-    -D SENSOR_LDR_minchange=10.0
+    -D dataLDR_minchange=10.0
-    -D SENSOR_LDR_senddelaymax=1000*60*1
+    -D dataLDR_readdelay=1000*2
+    -D dataLDR_senddelaymax=1000*60*1
 
 
 lib_deps = 
@@ -144,11 +143,11 @@ monitor_port = /dev/ttyUSB0
 monitor_speed = 115200
 
 build_flags =
-    -D SENSOR_MHZ19B
+    -D SENSOR_MHZ19
-    -D SENSOR_MHZ19B_SERIAL_RX=D5
+    -D MHZ19_SERIAL_RX=D5
-    -D SENSOR_MHZ19B_SERIAL_TX=D6
+    -D MHZ19_SERIAL_TX=D6
-    -D SENSOR_MHZ19B_minchange=10
+    -D dataMHZ19_minchange=10
-    -D SENSOR_MHZ19B_readdelay=10*1000
+    -D dataMHZ19_readdelay=10*1000
 
     -D SENSOR_SDS018
     -D SDS018_SERIAL_RX=D7
@@ -203,7 +202,7 @@ monitor_speed = 115200
 
 build_flags =
     -D SENSOR_DHT22
-    -D SENSOR_DHT22_PIN=D7
+    -D DHTPIN=D7
     -D dataDHT22_temperature_minchange=0.2
     -D dataDHT22_humidity_minchange=1.0
 
@@ -214,11 +213,11 @@ build_flags =
     -D dataBH1750_minchange=10.0
     -D dataBH1750_senddelaymax=1000*60*2
 
-    -D SENSOR_MHZ19B
+    -D SENSOR_MHZ19
-    -D SENSOR_MHZ19B_SERIAL_RX=D5
+    -D MHZ19_SERIAL_RX=D5
-    -D SENSOR_MHZ19B_SERIAL_TX=D6
+    -D MHZ19_SERIAL_TX=D6
-    -D SENSOR_MHZ19B_minchange=10
+    -D dataMHZ19_minchange=10
-    -D SENSOR_MHZ19B_readdelay=10*1000
+    -D dataMHZ19_readdelay=10*1000
 
 lib_deps =
     adafruit/DHT sensor library@1.3.10

src/main.cpp

@@ -173,33 +173,67 @@
   #endif
 #endif
 
+
 #ifdef SENSOR_LDR
-  #include "sensor_ldr.cpp"
+  struct sensordata dataLDR;
-  Sensor_LDR sensor_ldr(SENSOR_LDR_PIN);
+  float value_ldr=0;
-
+  #ifdef SENSOR_LDR_CALIB1
-  #ifndef SENSOR_LDR_minchange
+    #define LDRARRAYSIZE 18
-    #define SENSOR_LDR_minchange 10.0
+    //black wire of ldr connects to A0 with 10k to gnd. red wire connects with 1k to gnd and 2k2 to 3v3
-  #endif
+    static const unsigned int out_ldr[] = {0, 30, 50,  60,  130, 170, 250, 420, 780, 1300,2600, 5000, 5350, 7700, 10900, 12000, 17000,20000};  // x10  (i.e. gets later divided by 10)
-  #ifndef SENSOR_LDR_senddelaymax
+    static const unsigned int in_ldr[]  = {0, 12, 100, 150, 350, 400, 450, 650, 730,  780, 840, 930,  948 , 970,  993,   1005,  1019, 1023};  // 0 - 1023
-    #define SENSOR_LDR_senddelaymax 1000*60*1
-  #endif
-  #ifndef SENSOR_LDR_readdelay
-    #define SENSOR_LDR_readdelay 1000*2
   #endif
+  int get_lux(const unsigned int* _in, const unsigned int* _out, byte size); //for analog ldr light calculation
 #endif
 
-#ifdef SENSOR_MHZ19B
+#ifdef SENSOR_MHZ19
-  #include "sensor_mhz19b.cpp"
+  struct sensordata dataMHZ19;
-  Sensor_MHZ19B sensor_mhz19b(SENSOR_MHZ19B_SERIAL_RX,SENSOR_MHZ19B_SERIAL_TX);
+  /*
+  * MHZ19 Library: https://platformio.org/lib/show/1620/SevSegSPI
+  * Software Serial Library: https://platformio.org/lib/show/168/EspSoftwareSerial
 
-  #ifndef SENSOR_MHZ19B_minchange
+  */
-    #define SENSOR_MHZ19B_minchange 10.0
+  // SW Serial
+  //SW Serial RX: to mhz19 tx (green cable)
+  //SW Serial TX: to mhz19 rx (blue cable)
+  //co2 sensor needs 5v. Maybe better to Connect USB 5V directly (not through wemos d1 onboard diode which gives only 4.7V! at '5V' output)
+
+  //if ABC is disabled (see in setup function) sensor should be calibrated manually. leave outdoors (=400ppm) with no direct sunlight for >20min, then connect HD pin to GND for at least 7 seconds.
+  /* Pinout  (view from top, connector at the bottom)
+  * Vin, GND, NC, PWM
+  *  |    |    |    |
+  * /-----------------\
+  * |                 |
+  * |                 |
+  * |                 |
+  * |                 |
+  * \-----------------/
+  *    |  |  |  |  |
+  *   Vo Rx Tx NC HD
+  * 
+  *       [Connector]
+  */
+
+
+  #ifndef SOFTWARESERIAL_H
+  #include <SoftwareSerial.h>
+  #define SOFTWARESERIAL_H
   #endif
-  #ifndef SENSOR_MHZ19B_senddelaymax
+
-    #define SENSOR_MHZ19B_senddelaymax 1000*60*10
+  SoftwareSerial mhz19_swSerial;
-  #endif
+  #define BAUD_RATE_MHZ19 9600
-  #ifndef SENSOR_MHZ19B_readdelay
+
-    #define SENSOR_MHZ19B_readdelay 1000*10
+  #define MHZ19CALIBRATIONTOPIC
+
+  #include <MHZ19.h>
+  MHZ19 mhz19;
+  bool mhz19_ready=false;
+  int value_co2=-1; //[ppm]
+
+  int mhz19_readValue_reimplemented(Stream *_streamRef, MHZ19 *_mhz19Ref); //declare function
+
+  #ifdef MHZ19CALIBRATIONTOPIC
+  bool mhz19calibrationHandler(const HomieRange& range, const String& value);
   #endif
 #endif
 
@@ -372,13 +406,41 @@ void setup() {
   #endif
 
   #ifdef SENSOR_LDR
-    sensor_ldr.init();
+    Serial.println("initializing ldr");
-    sensor_ldr.setSettings(SENSOR_LDR_minchange,SENSOR_LDR_senddelaymax,SENSOR_LDR_readdelay);
+    pinMode(LDR_PIN, INPUT); //ldr
+    #ifdef dataLDR_readdelay
+    dataLDR.readdelay=dataLDR_readdelay;
+    #endif
+    #ifdef dataLDR_senddelaymax
+    dataLDR.senddelaymax=dataLDR_senddelaymax;
+    #endif
+    #ifdef dataLDR_minchange
+    dataLDR.minchange=dataLDR_minchange;
+    #endif
   #endif
 
-  #ifdef SENSOR_MHZ19B
+  #ifdef SENSOR_MHZ19
-    sensor_mhz19b.init();
+    Serial.println("initializing mhz19");
-    sensor_mhz19b.setSettings(SENSOR_MHZ19B_minchange,SENSOR_MHZ19B_senddelaymax,SENSOR_MHZ19B_readdelay);
+    #ifdef dataMHZ19_minchange
+      dataMHZ19.minchange=dataMHZ19_minchange;
+    #endif
+    #ifdef dataMHZ19_readdelay
+      dataMHZ19.readdelay=dataMHZ19_readdelay;
+    #endif
+    
+    mhz19_swSerial.begin(BAUD_RATE_MHZ19, SWSERIAL_8N1, MHZ19_SERIAL_RX, MHZ19_SERIAL_TX, false, 256);
+    mhz19.setSerial(&mhz19_swSerial);
+    
+    uint8_t mhz19abctries=10;
+    while(!mhz19.disableABC() && mhz19abctries>0) { //disable automatic baseline correction (abc does calibration every 24h -> needs to have 400ppm co2 level sometime during that time)
+      delay(500); //wait some time for mhz to be initialized
+      Serial.print("disableABC Failed! try="); Serial.println(mhz19abctries);
+      mhz19abctries--;
+    }
+    if (mhz19abctries>0) {
+      Serial.println("mhz19 abc disabled successfully");
+    }
+
   #endif
 
 
@@ -508,11 +570,21 @@ void setup() {
   #endif
 
   #ifdef SENSOR_LDR
-    sensor_ldr.advertise(sensorNode);
+    sensorNode.advertise("light");
+    analogRead(LDR_PIN); //first reading could be false
   #endif
 
-  #ifdef SENSOR_MHZ19B
+
-    sensor_mhz19b.advertise(sensorNode);
+
+
+
+  
+
+  #ifdef SENSOR_MHZ19
+    sensorNode.advertise("co2");
+    #ifdef MHZ19CALIBRATIONTOPIC
+      sensorNode.advertise("mhz19calibration").settable(mhz19calibrationHandler);
+    #endif
   #endif
 
   #ifdef SENSOR_SDS018
@@ -555,6 +627,72 @@ void loop() {
   Homie.loop();  
 }
 
+
+#ifdef SENSOR_LDR
+void loop_LDR()
+{
+  sensordata &d=dataLDR;
+  
+  bool _changed=false;
+  if (millis() >= (d.lastreadtime+d.readdelay)) {
+    value_ldr = get_lux(in_ldr, out_ldr, LDRARRAYSIZE)/10.0; //read light level in lux
+    if (fabs(d.lastsentvalue-value_ldr)>=d.minchange){
+      _changed=true;
+    }
+    d.lastreadtime=millis();
+  }
+
+  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
+    Serial.print("Sending LDR. reason=");
+    if (_changed) Serial.println("change"); else Serial.println("time");
+    checkESPStatus();
+
+    Homie.getLogger() << "light " << ": " << value_ldr << endl;
+    sensorNode.setProperty("light").send(String(value_ldr));
+    d.lastsentvalue=value_ldr;
+    
+    d.lastsent=millis();
+  }
+}
+#endif
+
+
+#ifdef SENSOR_MHZ19
+void loop_MHZ19()
+{
+  sensordata &d=dataMHZ19;
+  
+  bool _changed=false;
+  if (millis() >= (d.lastreadtime+d.readdelay)) {
+    mhz19_ready=mhz19.isReady();
+    //value_co2=mhz19.readValue(); //[ppm]
+    value_co2=mhz19_readValue_reimplemented(&mhz19_swSerial, &mhz19); //[ppm]  reimplemented function to fix no response issue
+    Homie.getLogger() << "read co2 " << ": " << value_co2 << " status=" << mhz19_ready << endl;
+    if (fabs(d.lastsentvalue-value_co2)>=d.minchange){
+      _changed=true;
+    }
+    d.lastreadtime=millis();
+  }
+
+  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
+    Serial.print("Sending MHZ19. reason=");
+    if (_changed) Serial.println("change"); else Serial.println("time");
+    checkESPStatus();
+
+    Homie.getLogger() << "co2 " << ": " << value_co2 << endl;
+    if (mhz19_ready){ //send no co2 values if not warmed up. can take several miniutes
+      sensorNode.setProperty("co2").send(String(value_co2));
+    }else{
+      Homie.getLogger() << "co2 not ready. didnt sent" << endl;
+    }
+    
+    d.lastsentvalue=value_co2;
+    
+    d.lastsent=millis();
+  }
+}
+#endif
+
 #ifdef SENSOR_SDS018
 void loop_SDS018_pm25()
 {
@@ -907,11 +1045,14 @@ void loopHandler() {
   #endif
 
   #ifdef SENSOR_LDR
-    sensor_ldr.sensorloop();
+    loop_LDR();
   #endif
 
-  #ifdef SENSOR_MHZ19B
+
-    sensor_mhz19b.sensorloop();
+  
+
+  #ifdef SENSOR_MHZ19
+    loop_MHZ19();
   #endif
 
   #ifdef SENSOR_SDS018
@@ -952,6 +1093,83 @@ void checkESPStatus()
 }
 
 
+//////////////////////////////////////////////////////////////////////////////
+// Calculate lux based on rawADC reading from LDR returns value in lux/10
+//////////////////////////////////////////////////////////////////////////////
+//quelle: https://groups.google.com/forum/#!topic/souliss/1kMAltPB2ME[1-25]
+#ifdef SENSOR_LDR
+int get_lux(const unsigned int* _in, const unsigned int* _out, byte size)
+{
+ 
+        // take care the value is within range
+ // val = constrain(val, _in[0], _in[size-1]);
+
+
+ unsigned int val = analogRead(LDR_PIN);
+ #ifdef DEBUG   //DEBUG++++++++++++++++
+        Serial.print("LDR RAW=: ");
+        Serial.println(val);
+ #endif
+ 
+ if (val <= _in[0]) return _out[0];
+ if (val >= _in[size-1]) return _out[size-1];
+
+
+ // search right interval
+ byte pos = 1;  // _in[0] allready tested
+ while(val > _in[pos]) pos++;
+
+
+ // this will handle all exact "points" in the _in array
+ if (val == _in[pos]) return _out[pos];
+
+
+
+ // interpolate in the right segment for the rest
+ return map(val, _in[pos-1], _in[pos], _out[pos-1], _out[pos]);
+}
+#endif
+
+
+#ifdef SENSOR_MHZ19
+byte mhz19_getCheckSum(byte* packet) {
+  byte checksum = 0;
+  for(uint8_t i = 1; i < 8; i++) {
+    checksum += packet[i];
+  }
+  checksum = 0xff - checksum;
+  checksum += 1;
+  return checksum;
+}
+
+int mhz19_readValue_reimplemented(Stream *_streamRef, MHZ19 *_mhz19Ref) { //same function as in mhz19 library from klevytskyi, but with delay between cmd send and response check
+  byte CMD_READ[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79}; // Read command
+  unsigned int co2 = -1;
+  unsigned char response[9];
+  _streamRef->write(CMD_READ, 9);
+
+  unsigned long _startwait=millis();
+  while (millis()-_startwait<100) { //wait for mhz19 to send response
+    //wait
+  }
+
+  if (_streamRef->available()) {
+    _streamRef->readBytes(response, 9);
+
+    byte crc = mhz19_getCheckSum(response);
+
+    if (response[0] == 0xFF && response[1] == CMD_READ[2] && response[8] == crc) {
+      unsigned int responseHigh = (unsigned int) response[2];
+      unsigned int responseLow = (unsigned int) response[3];
+      unsigned int ppm = (256*responseHigh) + responseLow;
+      co2 = ppm;
+    }
+  }
+
+  return co2;
+}
+#endif
+
 #ifdef SENSOR_SDS018
 void readSDS018() 
 {
@@ -1021,6 +1239,31 @@ void ICACHE_RAM_ATTR interrupt_raingauge()
 #endif
 
 
+/* #################################
+*  ########### topic handler #######
+*/
+
+#ifdef MHZ19CALIBRATIONTOPIC
+  bool mhz19calibrationHandler(const HomieRange& range, const String& value) {
+  if (range.isRange) {
+    return false; //if range is given but index is not in allowed range
+  }
+  Homie.getLogger() << "mhz19 calibration " << ": " << value << endl;
+  
+  if (value=="zero") {
+    mhz19.calibrateZero();
+    Homie.getLogger() << "mhz19 calibration " << ": " << value << endl;
+    #ifdef STATUSNODE
+    sensorNode.setProperty("status").send("MHZ19 Zero Calibration triggered");
+    #endif
+  } else {
+    Homie.getLogger() << "Value outside range" << endl;
+    return false;  
+  }
+  
+  return true;
+}
+#endif
 
 
 /*##################################