Learning Examples | Foundations | Hacking | Links
Examples > Control Structures
Switch (case) Statement
used with serial input
An if statement allows you to choose between two discrete options, TRUE or FALSE. When there are more than two options, you can use multiple if statements, or you can use the switch statement. Switch allows you to choose between several discrete options.
This tutorial shows you how to use switch to turn on one of several different LEDs based on a byte of data received serially. The sketch listens for serial input, and turns on a different LED for the characters a, b, c, d, or e.
Circuit
Five LEDs are attached to digital pins 2, 3, 4, 5, and 6. To make the sketch work, open the Serial Monitor, and send the characters a, b, c, d, or e, or any other character.
click the image to enlarge
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Schematic:
click the image to enlarge
Code