Thx helped me, seems to work correct in Pimatic.
Just have to check if the values of the MQ135 are correct.

Thx to your fast answers.

@mfalkvidd thx that was the reason!

@Sparkman thx changed it, seems to work

Have seen some output in the serial monitor, now i just have to read more about the meaning off it ^^

Hi everybody,
sry for my bad english at the beginning!

I'm very noobie in arduino & my sensors.

I try to combining a DHT11 & a MQ135 on a arduino nano with a NRF24I01+.
I think the connection should be ok.

My problem is the sketch! I surely made a mistake, but i dont know where! I took the HumiditySensor Example and the code from here:
arduino/AirQuality-MQ135.ino

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik EKblad
 * 
 * DESCRIPTION
 * This sketch provides an example how to implement a humidity/temperature
 * sensor using DHT11/DHT-22 
 * http://www.mysensors.org/build/humidity
 */
 
#include <SPI.h>
#include <MySensor.h>  
#include <DHT.h> 
#include <Wire.h>

#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define HUMIDITY_SENSOR_DIGITAL_PIN 8
#define CHILD_ID_AIQ 3
#define AIQ_SENSOR_ANALOG_PIN 0

#define MQ135_DEFAULTPPM 399 //default ppm of CO2 for calibration
#define MQ135_DEFAULTRO 68550 //default Ro for MQ135_DEFAULTPPM ppm of CO2
#define MQ135_SCALINGFACTOR 116.6020682 //CO2 gas value
#define MQ135_EXPONENT -2.769034857 //CO2 gas value
#define MQ135_MAXRSRO 2.428 //for CO2
#define MQ135_MINRSRO 0.358 //for CO2

unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)
float mq135_ro = 10000.0;    // this has to be tuned 10K Ohm
int val = 0;                 // variable to store the value coming from the sensor
float valAIQ =0.0;
float lastAIQ =0.0;

MySensor gw;
DHT dht;
MyMessage msg(CHILD_ID_AIQ, V_LEVEL);

float lastTemp;
float lastHum;
boolean metric = true; 
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);


void setup()  
{ 
  gw.begin();
  dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); 

  // Send the Sketch Version Information to the Gateway
  gw.sendSketchInfo("Humidity", "1.0");

  // Register all sensors to gw (they will be created as child devices)
  gw.present(CHILD_ID_HUM, S_HUM);
  gw.present(CHILD_ID_TEMP, S_TEMP);
  
  metric = gw.getConfig().isMetric;

  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("AIQ Sensor MQ135", "1.0");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_AIQ, S_AIR_QUALITY); 
}

/*
 * get the calibrated ro based upon read resistance, and a know ppm
 */
long mq135_getro(long resvalue, double ppm) {
return (long)(resvalue * exp( log(MQ135_SCALINGFACTOR/ppm) / MQ135_EXPONENT ));
}

/*
 * get the ppm concentration
 */
double mq135_getppm(long resvalue, long ro) {
double ret = 0;
double validinterval = 0;
validinterval = resvalue/(double)ro;
if(validinterval<MQ135_MAXRSRO && validinterval>MQ135_MINRSRO) {
ret = (double)MQ135_SCALINGFACTOR * pow( ((double)resvalue/ro), MQ135_EXPONENT);
}
return ret;
}

void loop()      
{  
  delay(dht.getMinimumSamplingPeriod());

  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
      Serial.println("Failed reading temperature from DHT");
  } else if (temperature != lastTemp) {
    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    gw.send(msgTemp.set(temperature, 1));
    Serial.print("T: ");
    Serial.println(temperature);
  }
  
  float humidity = dht.getHumidity();
  if (isnan(humidity)) {
      Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum) {
      lastHum = humidity;
      gw.send(msgHum.set(humidity, 1));
      Serial.print("H: ");
      Serial.println(humidity);
  }


  uint16_t valr = analogRead(AIQ_SENSOR_ANALOG_PIN);// Get AIQ value
  Serial.println(val);
  uint16_t val =  ((float)22000*(1023-valr)/valr); 
  //during clean air calibration, read the Ro value and replace MQ135_DEFAULTRO value with it, you can even deactivate following function call.
  mq135_ro = mq135_getro(val, MQ135_DEFAULTPPM);
  //convert to ppm (using default ro)
  valAIQ = mq135_getppm(val, MQ135_DEFAULTRO);

  Serial.print ( "Val / Ro / value:");
  Serial.print ( val);
  Serial.print ( " / ");
  Serial.print ( mq135_ro);
  Serial.print ( " / ");
  Serial.print ( valAIQ);

 
  if (valAIQ != lastAIQ) {
      gw.send(msg.set(MQ135_DEFAULTPPM+(int)ceil(valAIQ)));
      lastAIQ = ceil(valAIQ);
  }
 
  // Power down the radio.  Note that the radio will get powered back up
  // on the next write() call.
  gw.sleep(SLEEP_TIME); //sleep for: sleepTime

}
/*****************************  MQGetPercentage **********************************
Input:   rs_ro_ratio - Rs divided by Ro
         pcurve      - pointer to the curve of the target gas
Output:  ppm of the target gas
Remarks: By using the slope and a point of the line. The x(logarithmic value of ppm) 
         of the line could be derived if y(rs_ro_ratio) is provided. As it is a 
         logarithmic coordinate, power of 10 is used to convert the result to non-logarithmic 
         value.
************************************************************************************/ 
int  MQGetPercentage(float rs_ro_ratio, float ro, float *pcurve)
{
  return (double)(pcurve[0] * pow(((double)rs_ro_ratio/ro), pcurve[1]));
}

When I try to upload it there comes the output:

Arduino: 1.6.9 (Windows 10), Board: "Arduino Nano, ATmega328"

WARNUNG: Kategorie '' in der Bibliothek UIPEthernet ist ungültig und wird auf 'Uncategorized' festgelegt
libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::MySensor(MyTransport&, MyHw&)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::MySensor(MyTransport&, MyHw&)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::getNodeId()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::getConfig()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sendWrite(unsigned char, MyMessage&)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::getLastMessage()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::saveState(unsigned char, unsigned char)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::loadState(unsigned char)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::wait(unsigned long)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::process()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::requestNodeId()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::findParentNode()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sendRoute(MyMessage&)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::send(MyMessage&, bool)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sendBatteryLevel(unsigned char, bool)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::present(unsigned char, unsigned char, char const*, bool)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sendSketchInfo(char const*, char const*, bool)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::request(unsigned char, unsigned char, unsigned char)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::requestTime(void (*)(unsigned long))'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::setupNode()'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::begin(void (*)(MyMessage const&), unsigned char, bool, unsigned char)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sleep(unsigned long)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sleep(unsigned char, unsigned char, unsigned long)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

libraries\MySensors\MySensor.cpp.o: In function `MySensor::MySensor(MyTransport&, MyHw&)':

Mehrere Bibliotheken wurden für "DHT.h" gefunden
 Benutzt: C:\Users\Mike\Documents\Arduino\libraries\DHT
 Nicht benutzt: C:\Users\Mike\Documents\Arduino\libraries\DHT_sensor_library
C:\Users\Mike\Documents\Arduino\libraries\MySensors/MySensor.cpp:52: multiple definition of `MySensor::sleep(unsigned char, unsigned char, unsigned char, unsigned char, unsigned long)'

sketch\MySensor.cpp.o:sketch/MySensor.cpp:52: first defined here

collect2.exe: error: ld returned 1 exit status

exit status 1
Fehler beim Kompilieren für das Board Arduino Nano.

Dieser Bericht wäre detaillierter, wenn die Option
"Ausführliche Ausgabe während der Kompilierung"
in Datei -> Voreinstellungen aktiviert wäre.

I hope somebody can help me!

Thx Unci