Todd Treece has put together seven guides using Adafruit IO for input, temperature, humidity, servo control, and so much more:
Digital Input: Wire a circuit to send momentary button press data to your Adafruit IO Dashboard
Digital Output: Turn on a LED or a lamp from anywhere in the world!
Color: Send data from Adafruit IO to control a RGB LED.
Temperature and Humidity: Send humidity and temperature values from a DHT22 sensor to Adafruit IO
Analog Output: LED and other analog hardware control from Adafruit IO.
Analog Input: Send light sensor data in real-time and view it using using Adafruit IO.
Servo Control: Move physical objects...without wires!
The Adafruit Learning System is also a great place to find learning guides which answer the age-old maker question of "what do I build next?".
Here are some of our favorite guides using Adafruit IO:
Gmailbox
Build a physical mailbox for your emails using Adafruit IO and IFTTT
Adafruit IO Environmental Monitor for Feather or Raspberry Pi
Build an internet-enabled environmental monitor to see what's in the air you breathe using Arduino
Adafruit IO Home: Lights and Temperature
Learn all about home automation by building a cardboard smart-house, controlling its lights, and monitoring temperature!
Using IFTTT with Adafruit IO to Make an IoT Door Detector
Know who is comin' and goin'
Home Automation in the Cloud with the ESP8266 & Adafruit IO
Build a simple home automation system & control it from anywhere!
Cloud Cam: Internet-Connected Security Camera
Build a camera that detects motion and sends images to cloud services like Dropbox & Adafruit IO!
Smart Toilet Light
Make your toilet bowl glow with data from Adafruit IO!
The Adafruit Blog is also a good resource for finding your next project. Check out the Adafruit IO blog posts here!