Create App with Timer Object That Queries Website Data

This app shows how to create a timer object in App Designer that executes a function at regular time intervals. In this case, the app queries the wind speed from a web site every five seconds and plots the returned value.

This example also demonstrates the following app building tasks:

• Writing a callback for an object created programmatically (in this case, the timer object)

• Configuring a timer object to execute its callback at regular intervals

• Starting the timer when the user clicks the Start button

• Stopping the timer when the user clicks the Stop button

• Deleting the timer when the app closes