Part 2. Reading from a Sensor
If you're following along with a DHT22 sensor, here's a way you can wire it up to the Cactus Micro to read from it:
- Using female-female tie lines, connect the sensor’s + port to the Arduino’s VCC
- Connect the sensor’s - port to the Arduino’s GND
- Connect the sensor’s OUT to the Arduino’s 7 (any digital port will do, but this is the one I reference in the sketch)
- The sketch is called CMTempTest.ino in this repository. Copy it into a new sketch window.
- Make sure that the selected Board and Port reads “LilyPad Arduino USB on /dev/tty.usbmodem****”
- Upload the sketch
- Wait until it says “Done Uploading”, then open the Serial Monitor and you should see temperature in F and C, humidity, and heat index.
Note: If you skipped the previous section, make sure you have the DHT library installed
Now that we know we can read from sensors, it's time to connect to the internet!
<< Part 2: Installing the Arduino IDE and Libraries - Part 3: Connecting to the Hub >>