Is AM2302 same as DHT22?
The AM2302 is a wired version of the DHT22 , in a large plastic body. It 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).
Is DHT22 reliable?
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….DHT11 Vs DHT22/AM2302.
Humidity Range | 20-80% / 5% | 0-100% / 2-5% |
Temperature Range | 0-50°C / ± 2°C | -40 to 80°C / ± 0.5°C |
How many types of DHT sensors have?
The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.
What is the dht22/am2302 test?
This page covers tests of the DHT22 / AM2302 and description of the test methodology. For other types of devices, see the index of all my hygrometer testing . The DHT22 (a.k.a. AM2302, RHT03) is a popular hygrometer/thermometer in the hobbyist electronics community.
How does dht22 work?
The capacitive sensor element is used as the sensing element in DHT22. Wet NTC temperature measurement device is used in DHT22 for temperature calculation. This sensor can transmit the signal up to 2 meters. DHT22 has a single – wire serial interface, which makes it integration with microprocessors and microcontrollers east, simple and fast.
What does dht22 deviation from the reference mean?
Surfaces showing deviation of the DHT22 output from the reference value as a function of both temperature and relative humidity. This document is about humidity measurements and was motivated by the fact that hygrometers are difficult instruments to build and calibrate.
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.