Arduino Uno with Breadboard wired up to read output from DHT22 and write it to the Arduino Serial Monitor
The code and library I used is here at Adafruit DHT22 link. It all works seamlessly if you follow the instructions exactly. The default sensor in the code is DHT22. I tried other libraries and code, but this is the only one that worked first try!
Clarification on wire routing for first image:
Diagram # Route
1 between DHTpin2 and first resistor leg inline with DHTpin2
2 from DHTpin 4 to bb neg or Arduino gnd
3 (one leg of resistor) inline with DHTpin2
4 (other leg of resistor) inline with DHTpin2
5 inline with DHTpin2 to bb+ (completes signal line)
6 from DHTpin1 to bb+
7 from bb neg to Arduino gnd
(can do without and connect DHTpin4 directly to Arduino Ground)
8 from bb+ to Arduino 3.3v
Below is copy from the Arduino Serial Monitor output from the DHT22
DHT22 test! Humidity: 22.10 % Temperature: 23.10 *C 73.58 *F Heat index: 22.04 *C 71.68 *F Humidity: 22.00 % Temperature: 23.20 *C 73.76 *F Heat index: 22.15 *C 71.87 *F Humidity: 22.00 % Temperature: 23.20 *C 73.76 *F Heat index: 22.15 *C 71.87 *F Humidity: 21.90 % Temperature: 23.20 *C 73.76 *F Heat index: 22.15 *C 71.87 *F Humidity: 75.80 % Temperature: 23.60 *C 74.48 *F Heat index: 23.99 *C 75.19 *F << I breathed on the sensor Humidity: 70.00 % Temperature: 23.40 *C 74.12 *F Heat index: 23.62 *C 74.52 *F Humidity: 50.70 % Temperature: 23.30 *C 73.94 *F Heat index: 23.01 *C 73.42 *F Humidity: 36.10 % Temperature: 23.20 *C 73.76 *F Heat index: 22.52 *C 72.53 *F Humidity: 28.60 % Temperature: 23.20 *C 73.76 *F Heat index: 22.32 *C 72.18 *F Humidity: 25.30 % Temperature: 23.20 *C 73.76 *F Heat index: 22.24 *C 72.03 *F Humidity: 24.30 % Temperature: 23.30 *C 73.94 *F Heat index: 22.32 *C 72.18 *F Humidity: 23.70 % Temperature: 23.20 *C 73.76 *F Heat index: 22.19 *C 71.95 *F Humidity: 23.40 % Temperature: 23.20 *C 73.76 *F Heat index: 22.19 *C 71.94 *F Humidity: 23.30 % Temperature: 23.30 *C 73.94 *F Heat index: 22.29 *C 72.13 *F
