This is a fun and simple beginner project that turns the Circuit Playground into an inclinometer. An inclinometer is a device that can determine the angle of something relative to the horizontal. With this information and some right angle math, the height of tall objects can be determined. Don't worry, all the math is provided and use of a calculator is allowed.
This project uses the sensors already included on the Circuit Playground so no additional electronics or soldering are required. You will also need some batteries and a holder for the batteries.
To build the inclinometer, you will need a few other items. A plastic tube is used to create a sight. This could be a drinking straw, the barrel of an old writing pen, or anything similar. Some rubber bands are used to hold the sight to the battery pack. Double backed tape provides a secure way of mounting the Circuit Playground to the battery pack.
If you are new to the Circuit Playground, you may want to first read these overview guides.
This project will use the Arduino IDE. Make sure you have added the board support for the Circuit Playground as well as installed the Circuit Playground library. MUST DO BOTH. This is covered in the guides linked above.