1) DHT11/DHT22 Temperature and Humidity Sensor.
1) DHT11/DHT22 Temperature and Humidity Sensor
These DHTXX sensors are very popular
among the Arduino
Tinkerers. The DHT sensors are inexpensive
sensors for measuring temperature and humidity.
These sensors contain a chip that does analog to digital conversion and spits out a digital signal with the temperature and humidity.
Specifications DHT11 vs DHT22
There are two versions of the DHT sensor:
DHT11
Range: 20-90%
Absolute accuracy: ±5%
Repeatability: ±1%
Long term stability: ±1% per year
Price: $1 to $5
DHT22
Range: 0-100%
Absolute accuracy: ±2%
Repeatability: ±1%
Long term stability: ±0.5% per year
Price: $4 to $10
As you can see from the specs above, the DHT22 is a bit more accurate.
Arduino with DHT11 Sensor
For this example you need the following components.
- Arduino UNO
- 1x DHT11
- Breadboard
- 10KΩ Resistor (or 4.7KΩ)
- Jumper Wires
Schematic
Here’s how to connect the DHT11 to an Arduino:
Download the DHT11 library here
Unzip the DHT library
Rename the extracted folder to DHT and remove the “-“. Otherwise your Arduino IDE won’t recognize your library
Install the DHT11 in your Arduino IDE: go to Sketch 🞂 Include Library 🞂 Add . ZIP library and select the library you’ve just downloaded
Restart your Arduino IDE
Go to File 🞂 Examples 🞂 DHT sensor library 🞂 DHTtester
Upload the code
Demonstration
In this project the Arduino is measuring the temperature and humidity. Those two measurements are being displayed on the serial monitor. Here’s what you should see in your Arduino IDE serial monitor.
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