Sensor dht+relay won't send data or present

MasMat

Hi everyone,
Started a challenging sensor immediately: RF24+relay+dht11.
Radio seems to work, sensor gets power and the debug-mqtt appears to show all proper presentations. Using Domoticz, the node is seen but only s_hum and s_binary. The humidity sensor wont show in devices, the relay is seen but doesnt respond.
I think I have a problem with my code. I'm using a millis-counter to send temp+hum every 60s and have the relay at the ready constantly.

Pls help.

// Enable debug prints
#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 4

// 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 = 60000;

// 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;

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time DHT was updated

// constants won't change :
const long interval = 60000;           // interval at which to read DHT (milliseconds)

MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;

#define RELAY_1  3  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 1 // Total number of attached relays
#define RELAY_ON 0  // GPIO value to write to turn on attached relay
#define RELAY_OFF 1 // GPIO value to write to turn off attached relay

void before()
{
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);
    // Set relay to last known state (using eeprom storage)
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}

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;

  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Relay", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_BINARY);
  }
}


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()      
{  
 unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you checked DHT
    previousMillis = currentMillis;

  // 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); 
}
}

void receive(const MyMessage &message)
{
  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_STATUS) {
    // Change relay state
    digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
    // Store state in eeprom
    saveState(message.sensor, message.getBool());
    // Write some debug info
    Serial.print("Incoming change for sensor:");
    Serial.print(message.sensor);
    Serial.print(", New status: ");
    Serial.println(message.getBool());
  }
}

gohan

On my Domoticz the dht11 shows as a combined temphum and it shows both data even if I present it separately

MasMat

I think there's a bigger clitch in my code somewhere that is causing that. I'm not sure if the millis-timer is properly used here or if that is somehow interfering with the other code.

gohan

I'd use a wait (500) or (1000) at the end of the loop, to slow things down a bit

MasMat

@gohan you mean "delay(500)"? Will that not affect the radio function if it is waiting for a command for the relay for example?

MasMat

The startup serial "seems" OK, but the relay function is not there. The MQTT log appears to send empty strings "" rather than 0 or 1 when I attempt to activate the relay from Domoticz.
Just in case, the startup serial is as follows:

0 MCO:BGN:INIT NODE,CP=RNNNA--,VER=2.1.1
3 MCO:BGN:BFR
4 TSM:INIT
5 TSF:WUR:MS=0
12 TSM:INIT:TSP OK
14 TSF:SID:OK,ID=1
16 TSM:FPAR
52 TSF:MSG:SEND,1-1-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
319 TSF:MSG:READ,0-0-1,s=255,c=3,t=8,pt=1,l=1,sg=0:0
324 TSF:MSG:FPAR OK,ID=0,D=1
2059 TSM:FPAR:OK
2060 TSM:ID
2061 TSM:ID:OK
2063 TSM:UPL
2068 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2075 TSF:MSG:READ,0-0-1,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2080 TSF:MSG:PONG RECV,HP=1
2082 TSM:UPL:OK
2084 TSM:READY:ID=1,PAR=0,DIS=1
2089 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2098 TSF:MSG:READ,0-0-1,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2105 TSF:MSG:SEND,1-1-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.1.1
2113 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
2240 TSF:MSG:READ,0-0-1,s=255,c=3,t=6,pt=0,l=1,sg=0:M
2247 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=11,pt=0,l=22,sg=0,ft=0,st=OK:TemperatureAndHumidity
2257 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.1
2266 TSF:MSG:SEND,1-1-0-0,s=0,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
2273 TSF:MSG:SEND,1-1-0-0,s=1,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=OK:
2281 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=11,pt=0,l=5,sg=0,ft=0,st=OK:Relay
2289 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.0
2297 TSF:MSG:SEND,1-1-0-0,s=1,c=0,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
2304 MCO:REG:REQ
2307 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
2345 TSF:MSG:READ,0-0-1,s=255,c=3,t=27,pt=1,l=1,sg=0:1
2351 MCO:PIM:NODE REG=1
2353 MCO:BGN:STP
2355 MCO:SLP:MS=2000,SMS=0,I1=255,M1=255,I2=255,M2=255
2360 MCO:SLP:TPD
2362 MCO:SLP:WUP=-1
2364 MCO:BGN:INIT OK,TSP=1```

HenryWhite

@MasMat said in Sensor dht+relay won't send data or present:

@gohan you mean "delay(500)"? Will that not affect the radio function if it is waiting for a command for the relay for example?

That's what wait() is for (mysensors specific) , it will not interfere with the radio commumication.

MasMat

Thanks for the tip. Good to learn these things as I go.

I'm to the point of rebuilding the sensor (or building a duplicate really) to see if this could be a hardware glitch.

gohan

You could try ethernet gateway instead of mqtt if it works better and move to mqtt later on

MasMat

@gohan I cant see the upside to going back since I couldnt get the Ethernet gw working but the mqtt appears to be working AND Domoticz supports it apparently.
I did a quick breadboard setup and it seems the problem might be hardware rather than sketch.

Question about the wait command: could I use wait (=soooo simple) rather than a millis timer to have a sensor/node be ready to activate a relay at any time but to only send DHT data every 60s or so?

gohan

sure you can use the wait()

MasMat

To follow up. It was hardware: broken vcc pin on the dht11 corrupted the whole sensor code badly. Resolder and added wait-code, inverted the on-off 0-vs-1 and I have a good working sensor. The duplicate is also installed and working reliably.
A 6-relay board is also working nicely and Domoticz is great. My old system is nearly replaced and I couldnt be happier.

Respect and thanks all around!

Sensor dht+relay won't send data or present

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