Saturday, March 14, 2015

IC Station DHT22 Temperature Humidity

This tutorial will teach you how to read temperature and humidity readings using the IC Station DHT22 Temperature & Humidity Module. Once you have those readings, you can calculate neat things like Heat Index and Dew Point, and by adding a wind speed sensor, Wind Chill.

Use checkout code "steveics", and get a 15% discount on the sensors!

Code: steveics Discount Amount: 15% Max Use: 1 No Min Order Started Date: 16th Mar, 2015 Ended Date: 16th May, 2015

Unlike the bare sensors, this one is assembled with the appropriate resistor, so there's only 3 connections. + connects to Arduino 5v or 3.3v, - to Ground, and out connects to the digital pin of your choice. We are using pin 2 per the included example.

Once again we are using an awesome library written by Adafruit:

DHT Sensor Library

Download and import into your Arduino sketchbook libraries folder using the import library feature in the IDE per our previous tutorial.

Load the example sketch DHTtester found under File, Examples, DHT Sensor Library.

Since we are using the Arduino Micro, we added the following line just after Serial.begin(9600);

  while (!Serial) ; //needed for leonardo and micro

Now upload to your Arduino and run the Serial Monitor. You should see something similar to the following:

This example already includes Metric and Standard unit display. We will be adding Dew Point calculations at a later date.

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