Likewise, it is fairly easy to connect up to the DHT sensors. They have four pins
- VCC - red wire Connect to 3.3 - 5V power. Sometime 3.3V power isn't enough in which case try 5V power.
Data out - white or yellow wire
- Not connected
Ground - black wire
Simply ignore pin 3, it's not used. You will want to place a 10 Kohm resistor between VCC and the data pin, to act as a medium-strength pull up on the data line. The Arduino has built in pullups you can turn on but they're very weak, about 20-50K
This diagram shows how we will connect for the testing sketch. Connect data to pin 2, you can change it later to any pin.
If you have an AM2302