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Arduino mega pinout i2c3/8/2024 ![]() The relative humidity does take temperature into account. But what’s the difference? The absolute humidity is the amount of water vapor in the air (expressed in g/m³), regardless of temperature. When you look at the datasheet of the DHTxx sensors, you will see that they measure the relative humidity (RH) of the air and not the absolute humidity. It also stores the calibration coefficients and does the analog to digital conversion. On the back of the sensor, you will find a small IC that measures and processes the analog signal. The sensor measures the resistance between the electrodes, which changes depending on the amount of moisture in the air. The humidity sensing element consists of two electrodes with a moisture holding substrate in between. If you open up a DHT11 or DHT22/AM2302 sensor, you will see that it contains two sensing elements: a humidity sensing element and an NTC (thermistor). How do DHT11 and DHT22/AM2302 temperature and humidity sensors work? As an Amazon Associate we earn from qualifying purchases. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. Supplies Hardware components 4 pin DHT11 sensorĥ – 10 kΩ resistor (only for 4 pin sensors) TMP36 analog temperature sensor with Arduino tutorial.LM35 analog temperature sensor with Arduino tutorial.Other Useful Links From Around The Web:.Fatal error: Adafruit_Sensor.h: No such file or directory.Example code for DHT11 and DHT22/AM2302 temperature and humidity sensor with I2C LCD and Arduino.DHT11/DHT22 temperature and humidity sensor Arduino example code.Installing the required Arduino libraries. ![]() Wiring – Connecting DHT11 and DHT22/AM2302 to Arduino Uno.How do DHT11 and DHT22/AM2302 temperature and humidity sensors work?.
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