Likewise, it is fairly easy to connect up to the DHT sensors. They have four pins
- VCC (3 to 5V power)
- Data out
- Not connected
Simply ignore pin 3, its not used. You will want to place a 10K 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 100K
This diagram shows how we will connect for the testing sketch. Connect data to pin 2, you can change it later to any pin.