Failed to read from DHT sensor!

Sensors
1

Hi,

I am trying to connect my DHT22 sensor to TTGO LoRa32 868MHz v1 (SX1276 without display). I connected the data pin of the DHT to GPIO 16, in the terminal i get an error Failed to read from DHT sensor! Or when i get the read its
[ “Subject: /DHTtoMQTT/dht1” N: Received json : {“hum”:3291,“tempc”:9.8,“tempf”:49.64}]
Any help from someone please.

Thanks

2

Hi,

Are you using the binaries, arduino ide or platformio, if one of the last two, may you share your configurations files that have been modified ?

3

Im using arduino ide code.
confing_DHT.h:
/----------------------------USER PARAMETERS-----------------------------/
/-------------DEFINE YOUR MQTT PARAMETERS BELOW----------------/
#define DHTTOPIC "/DHTtoMQTT/dht1"
#define dht_always true // if false when the current value for temp or hum is the same as previous one don’t send it by MQTT
#define TimeBetweenReadingDHT 30000 // time between 2 DHT readings
/-------------DHT SENSOR TYPE-------------/
//#define DHT_SENSOR_TYPE DHT11 //uncomment for DHT11 Sensor
//#define DHT_SENSOR_TYPE DHT21 //uncomment for DHT21 Sensor
#define DHT_SENSOR_TYPE DHT22 //uncomment for DHT22 Sensor (default for backwards compatibility)
/-------------------PIN DEFINITIONS----------------------/
#ifndef DHT_RECEIVER_GPIO
# if defined(ESP8266)
# define DHT_RECEIVER_GPIO 5 //5 = D1 you can put 14 = D5 if you don’t use HCSR501 sensor and the RFM69
# elif defined(ESP32);
# define DHT_RECEIVER_GPIO 16
# else
# define DHT_RECEIVER_GPIO 8
# endif
;#endif

#endif

**In User_confing.h i have manually set up wifi and mqtt and **
** uncommented and defined modules **
//#define ZgatewayRF “RF” //ESP8266, Arduino, ESP32
//#define ZgatewayIR “IR” //ESP8266, Arduino, Sonoff RF Bridge
//#define ZgatewayLORA “LORA” //ESP8266, Arduino, ESP32
//#define ZgatewayPilight “Pilight” //ESP8266, Arduino, ESP32
//#define ZgatewayWeatherStation “WeatherStation” //ESP8266, Arduino, ESP32
#define ZgatewayBT “BT” //ESP8266, ESP32
//#define ZgatewayRF2 “RF2” //ESP8266, Arduino, ESP32
//#define ZgatewaySRFB “SRFB” // Sonoff RF Bridge
//#define Zgateway2G “2G” //ESP8266, Arduino, ESP32
//#define ZgatewayRFM69 “RFM69” //ESP8266, Arduino, ESP32
//#define ZactuatorONOFF “ONOFF” //ESP8266, Arduino, ESP32, Sonoff RF Bridge
//#define ZsensorINA226 “INA226” //ESP8266, Arduino, ESP32
//#define ZsensorHCSR04 “HCSR04” //ESP8266, Arduino, ESP32
//#define ZsensorHCSR501 “HCSR501” //ESP8266, Arduino, ESP32, Sonoff RF Bridge
//#define ZsensorADC “ADC” //ESP8266, Arduino, ESP32
//#define ZsensorBH1750 “BH1750” //ESP8266, Arduino, ESP32
//#define ZsensorTSL2561 “TSL2561” //ESP8266, Arduino, ESP32
//#define ZsensorBME280 “BME280” //ESP8266, Arduino, ESP32
//#define ZsensorHTU21 “HTU21” //ESP8266, Arduino, ESP32
#define ZsensorDHT “DHT” //ESP8266, Arduino, ESP32, Sonoff RF Bridge
#define ZsensorDS1820 “DS1820” //ESP8266, Arduino, ESP32
//#define ZsensorGPIOKeyCode “GPIOKeyCode” //ESP8266, Arduino, ESP32
//#define ZsensorGPIOInput “GPIOInput” //ESP8266, Arduino, ESP32
//#define ZmqttDiscovery “HADiscovery”//ESP8266, Arduino, ESP32, Sonoff RF Bridge
//#define ZactuatorFASTLED “FASTLED” //ESP8266, Arduino, ESP32, Sonoff RF Bridge
//#define ZboardM5STICKC "M5StickC"
//#define ZboardM5STICKCP "M5StickCP"
//#define ZboardM5STACK "ZboardM5STACK"
//#define ZradioCC1101 “CC1101” //ESP8266, ESP32
//#define ZactuatorPWM “PWM” //ESP8266, ESP32
//#define ZsensorSHTC3 “SHTC3” //ESP8266, Arduino, ESP32, Sonoff RF Bridge
//#define ZactuatorSomfy “Somfy” //ESP8266, Arduino, ESP32
//#define ZgatewayRS232 “RS232” //ESP8266, Arduino, ESP32

Or do you need full user_confing.h

4

Could you formqt your code properly please, it is difficult to read like that.

Are you using the exact libraries given with the release?

5

Im using ttgo-lora32-v1-libraries.zip
I don’t know if it’s the correct one but BT and OneWire works.

DHT.h

#ifndef config_DHT_h
#define config_DHT_h

extern void setupDHT();
extern void DHTtoMQTT();
/*----------------------------USER PARAMETERS-----------------------------*/
/*-------------DEFINE YOUR MQTT PARAMETERS BELOW----------------*/
#define DHTTOPIC              "/DHTtoMQTT/dht1"
#define dht_always            true // if false when the current value for temp or hum is the same as previous one don't send it by MQTT
#define TimeBetweenReadingDHT 30000 // time between 2 DHT readings
/*-------------DHT SENSOR TYPE-------------*/
//#define DHT_SENSOR_TYPE DHT11 //uncomment for DHT11 Sensor
//#define DHT_SENSOR_TYPE DHT21 //uncomment for DHT21 Sensor
#define DHT_SENSOR_TYPE DHT22 //uncomment for DHT22 Sensor (default for backwards compatibility)
/*-------------------PIN DEFINITIONS----------------------*/
#ifndef DHT_RECEIVER_GPIO
#  if defined(ESP8266)
#    define DHT_RECEIVER_GPIO 5 //5 = D1 you can put 14 = D5 if you don't use HCSR501 sensor and the RFM69
#  elif defined(ESP32)
#    define DHT_RECEIVER_GPIO 16
#  else
#    define DHT_RECEIVER_GPIO 8
#  endif
#endif

#endif

And do you need full user config code or just some specific codes lines.