How accurate is DHT22?
Also the DHT22 sensor has better humidity measuring range, from 0 to 100% with 2-5% accuracy, while the DHT11 humidity range is from 20 to 80% with 5% accuracy.
What is inside DHT22?
The DHT22 is a basic digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin, no analog input pins needed.
Is DHT22 waterproof?
DHT22 is better then DHT11, but it isn’t a waterproof sensor, check DS18B20 for waterproof temperature sensor.
Does DHT22 need a resistor?
To make use of the DHT22 with your Arduino, you will want to use a 10k ohm resistor to act as a pull-up resistor on the data line. One of the coolest things with this sensor is that it can track both the humidity and temperature. These two measurements will come in handy with a lot of different projects.
What is the temperature range of DHT22?
-40 to +125 degrees Celsius
The DHT22 is the more expensive version which obviously has better specifications. Its temperature measuring range is from -40 to +125 degrees Celsius with +-0.5 degrees accuracy, while the DHT11 temperature range is from 0 to 50 degrees Celsius with +-2 degrees accuracy.
Is DHT22 analog or digital?
The DHT22 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed).
How do I install the dht22 library in Arduino IDE?
It uses a non-standard 1-wire digital signalling protocol. To install this library for use with the Arduino IDE, copy it to the `libraries’ folder and restart the IDE. For an example of how to use it, see File->Examples->DHT22->Serial .
How does the dht11/dht22 work?
The DHT11/ DHT22 consist of a humidity sensing component and a NTC temperature sensor (or thermistor). Furthermore, there is an IC on the back side of the sensor. For measuring humidity, humidity sensing component is used. It has two electrodes with moisture holding substrate between them.
How can I read data from a dht22 sensor?
You can use the DHT22 (or AM2302) humidity/temperature sensor and the Arduino UNO board to read data and print it out to the serial monitor or to display it on an LCD. In my case I chose the serial monitor version because is faster and cheaper, but you may want to look at other articles, including this one, if you want to use an LCD.