Try use DHT22 with Raspberry Pi 3! Tested by Raspbian Stretch (ver. Sep. 2017) and WiringPi v2.44.

1. Open the terminal in Raspbian.
2. Check your Git installation.

$ sudo apt-get install git-core

3. Enter a clone command with this repository address.

$ git clone https://github.com/ccoong7/DHT22.git

1. When clone success, change directory to DHT22.

$ cd ~/DHT22

2. Compile source code to generate an executable file.

$ gcc -o dht22.out dht22.c -lwiringPi

3. Launch!

$ ./dht22.out

• Vcc 3.3V
• Signal pin is GPIO 18 (With 5k resistor or 10k parallel)
• 3rd pin is not used
• GND

Visit my blog and get more information. (in Korean)

• How to use DHT22?
• How DHT22 works and sending out data?
• How to process temperature and humidity data?