Questions tagged [dht22]

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DHT11 sensor not working on ESP8266, no response

recently Ive set up an ESP8266 to control temperature and humidity in rooms, for this Im using DHT11 sensor, thats the basic code I have in order to check functionality in Arduino IDE #include "...
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1answer
55 views

My DHT22 module doesn`t work at all

I had bought this DHT22 module on AliExpress. The module looks fine, but it does not work at all. I had tried lots of sketches, I tried to change the pin, I tried to change the cables, but I always ...
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32 views

DHT22 Failed to Read Temperature

Readings are good at a distance of 30cm(approx). But gives NAN error beyond. Even at 30cm, it some times gives NAN. What maybe the issue? Tried with 10k pull up resistor also. Maybe a fake product as ...
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46 views

Why do random characters fill up my Arduino LCD Display?

I am making a water pump system for plants and I am running into trouble with displaying my Temperature and Humidity values. I am using a 20x4 LCD, Arduino board uno, Capacitive soil moisture sensor, ...
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1answer
923 views

DHT11 analog or digital?

I saw some projects with DHT11, some connect it with analog pin, others connect with digital pin. Is there any difference / advantage connecting to the analog?
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1answer
71 views

Reading DHT22 reboots arduino

I’ve got a quite weird behavior of DHT library. I’ve got DHT22 sensor. If it’s signal cable is not connected, reading the sensor causes a problem: Arduino reboots or hangs in unpredictable places. ...
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2answers
349 views

To control the relay switching in nextion using esp32 Microcontroller

I have developed the code to control the relay switching on/off using nextion display and esp32. But whenever I press my dual state button in the nextion display there is some delay and I need to ...
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1answer
380 views

How to add calibration to a humidity contoller using UNO and DHT22 sensor?

I am using a setup that helps controlling humidity in an enclosure used to store a humidity sensitive product. My original posting is here. I'm using a NANO and a DHT22 temperature/humidity sensor ...
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2answers
75 views

How to obtain the type of DHT sensor

I made a simple temperature controller on DHT11. I want it to work with DHT22 as well having the same code. However, I can’t find a way how to get known what type of sensor is installed. Is there a ...
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1answer
64 views

Comparing a text string to text output (DHT22)

Lately I've received a DHT22 sensor. I've started to create a small temperature and humidity monitor station. One of the things I noticed was if you pulled out the sensor while in use, it displayed "...