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

[vladimir]

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:

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)
  sleep(dht.getMinimumSamplingPeriod());
}


void loop()      
{  
  // Force reading sensor, so it works also after sleep()
  dht.readSensor(true);

  // 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: ");
    Serial.println(temperature);
    #endif
  } else {
    // Increase no update counter if the temperature stayed the same
    nNoUpdatesTemp++;
  }

  // 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: ");
    Serial.println(humidity);
    #endif
  } else {
    // Increase no update counter if the humidity stayed the same
    nNoUpdatesHum++;
  }

  // Sleep for a while to save energy
  sleep(UPDATE_INTERVAL); 
}

Debug information from the sensor:

16 MCO:BGN:INIT NODE,CP=RNNNA---,VER=2.2.0
25 TSM:INIT
26 TSF:WUR:MS=0
33 TSM:INIT:TSP OK
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
2196 TSF:MSG:PONG RECV,HP=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

[mfalkvidd]

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

[vladimir]

This post is deleted!

[vladimir]

@mfalkvidd Thank you! :raised_hands: Everything worked! :star2:

[mfalkvidd]

@vladimir great! Thanks for reporting back.

[vladimir]

@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.

[mfalkvidd]

@vladimir I have no experience with OpenHab. Sorry.

[vladimir]

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

[mfalkvidd]

@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.

[bgunnarb]

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.