The temperature and humidity sensor sends only humidity. Please help me understand.

  • Hello! I'm trying to connect a temperature and humidity sensor to Openhab 2.2.
    The sensor is detected automatically as "Humidity Sensor".
    But it displays the following:
    Humidity Sensor

    Please help me understand and solve the problem. What am I doing wrong?

    Sensor code:

    #define MY_DEBUG
    // Enable and select radio type attached 
    #define MY_RADIO_NRF24
    //#define MY_RADIO_RFM69
    //#define MY_RS485
    #include <SPI.h>
    #include <MySensors.h>  
    #include <DHT.h>
    // Set this to the pin you connected the DHT's data pin to
    #define DHT_DATA_PIN 3
    // Set this offset if the sensor has a permanent small offset to the real temperatures
    #define SENSOR_TEMP_OFFSET 0
    // Sleep time between sensor updates (in milliseconds)
    // Must be >1000ms for DHT22 and >2000ms for DHT11
    static const uint64_t UPDATE_INTERVAL = 10000;
    // Force sending an update of the temperature after n sensor reads, so a controller showing the
    // timestamp of the last update doesn't show something like 3 hours in the unlikely case, that
    // the value didn't change since;
    // i.e. the sensor would force sending an update every UPDATE_INTERVAL*FORCE_UPDATE_N_READS [ms]
    static const uint8_t FORCE_UPDATE_N_READS = 10;
    #define CHILD_ID_HUM 0
    #define CHILD_ID_TEMP 1
    float lastTemp;
    float lastHum;
    uint8_t nNoUpdatesTemp;
    uint8_t nNoUpdatesHum;
    bool metric = true;
    MyMessage msgHum(CHILD_ID_HUM, V_HUM);
    MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
    DHT dht;
    void presentation()  
      // Send the sketch version information to the gateway
      sendSketchInfo("TemperatureAndHumidity", "1.1");
      // Register all sensors to gw (they will be created as child devices)
      present(CHILD_ID_HUM, S_HUM);
      present(CHILD_ID_TEMP, S_TEMP);
      metric = getControllerConfig().isMetric;
    void setup()
      dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
      if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
        Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
      // Sleep for the time of the minimum sampling period to give the sensor time to power up
      // (otherwise, timeout errors might occure for the first reading)
    void loop()      
      // Force reading sensor, so it works also after sleep()
      // Get temperature from DHT library
      float temperature = dht.getTemperature();
      if (isnan(temperature)) {
        Serial.println("Failed reading temperature from DHT!");
      } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
        // Only send temperature if it changed since the last measurement or if we didn't send an update for n times
        lastTemp = temperature;
        if (!metric) {
          temperature = dht.toFahrenheit(temperature);
        // Reset no updates counter
        nNoUpdatesTemp = 0;
        temperature += SENSOR_TEMP_OFFSET;
        send(msgTemp.set(temperature, 1));
        #ifdef MY_DEBUG
        Serial.print("T: ");
      } else {
        // Increase no update counter if the temperature stayed the same
      // Get humidity from DHT library
      float humidity = dht.getHumidity();
      if (isnan(humidity)) {
        Serial.println("Failed reading humidity from DHT");
      } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS) {
        // Only send humidity if it changed since the last measurement or if we didn't send an update for n times
        lastHum = humidity;
        // Reset no updates counter
        nNoUpdatesHum = 0;
        send(msgHum.set(humidity, 1));
        #ifdef MY_DEBUG
        Serial.print("H: ");
      } else {
        // Increase no update counter if the humidity stayed the same
      // Sleep for a while to save energy

    Debug information from the sensor:

    25 TSM:INIT
    26 TSF:WUR:MS=0
    35 TSF:SID:OK,ID=24
    37 TSM:FPAR
    73 TSF:MSG:SEND,24-24-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
    627 TSF:MSG:READ,0-0-24,s=255,c=3,t=8,pt=1,l=1,sg=0:0
    632 TSF:MSG:FPAR OK,ID=0,D=1
    2081 TSM:FPAR:OK
    2082 TSM:ID
    2083 TSM:ID:OK
    2085 TSM:UPL
    2088 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
    2191 TSF:MSG:READ,0-0-24,s=255,c=3,t=25,pt=1,l=1,sg=0:1
    2198 TSM:UPL:OK
    2200 TSM:READY:ID=24,PAR=0,DIS=1
    2204 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
    2332 TSF:MSG:READ,0-0-24,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
    2340 TSF:MSG:SEND,24-24-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.2.0
    2349 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
    2586 TSF:MSG:READ,0-0-24,s=255,c=3,t=6,pt=0,l=1,sg=0:M
    2593 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=11,pt=0,l=22,sg=0,ft=0,st=OK:TemperatureAndHumidity
    2604 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.1
    2612 TSF:MSG:SEND,24-24-0-0,s=0,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
    2653 !TSF:MSG:SEND,24-24-0-0,s=1,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=NACK:
    2660 MCO:REG:REQ
    2663 TSF:MSG:SEND,24-24-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=1,st=OK:2
    2938 TSF:MSG:READ,0-0-24,s=255,c=3,t=27,pt=1,l=1,sg=0:1
    2944 MCO:PIM:NODE REG=1
    2946 MCO:BGN:STP
    2952 MCO:SLP:MS=2000,SMS=0,I1=255,M1=255,I2=255,M2=255
    2957 TSF:TDI:TSL
    2959 MCO:SLP:WUP=-1
    2961 TSF:TRI:TSB
    2963 MCO:BGN:INIT OK,TSP=1
    2972 TSF:MSG:SEND,24-24-0-0,s=1,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:26.8
    T: 26.80
    2980 TSF:MSG:SEND,24-24-0-0,s=0,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=OK:14.2
    H: 14.20
    2988 MCO:SLP:MS=10000,SMS=0,I1=255,M1=255,I2=255,M2=255
    2993 TSF:TDI:TSL
    2995 MCO:SLP:WUP=-1
    2997 TSF:TRI:TSB
    3005 TSF:MSG:SEND,24-24-0-0,s=1,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:26.5
    T: 26.50
    3014 TSF:MSG:SEND,24-24-0-0,s=0,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=OK:14.3
    H: 14.30
    3021 MCO:SLP:MS=10000,SMS=0,I1=255,M1=255,I2=255,M2=255
    3026 TSF:TDI:TSL

    My node is built on Arduino Nano + NRF24L01+
    My gateway node is built on NodeMcu + NRF24L01+
    Controller Openhab 2.2 (Openhabian + Raspberry Pi 3)
    MySensors library 2.2

  • Mod

    @vladimir the presentation message for temperature failed (indicated by st=NACK in the log)
    Add wait(200); before the presentation line, that usually helps

  • This post is deleted!

  • @mfalkvidd Thank you! 🙌 Everything worked! 🌟

  • Mod

    @vladimir great! Thanks for reporting back.

  • @mfalkvidd Tell me please, can I somehow unite them in one device? Now this sensor is displayed as two separate devices. But this is one physical device.
    alt text

  • Mod

    @vladimir I have no experience with OpenHab. Sorry.

  • @mfalkvidd I assumed that this change is made in the code of the sensor itself. For example, during its presentation.

  • Mod

    @vladimir in my experience, it is not. Domoticz unites some of my sensors even when I don't want them united. My guess is that OpenHab is equally annoying, but in the other direction.

  • I agree with @mfalkvidd. This is not due to the sensor code but this is the way OH handles the data.

    I'm using OH but the MQTT 1.x binding that does not support discovery. I manually define three logical devices, temp, hum and batt in the .items file. I think this is the expected behaviour of OH.

    If you want them presented as one device you could combine the measurements into one string by using a rule and do some string manipulation. I do this to combine wind speed and direction into one string.

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