Arduino 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.

Arduino Switch (case2) Statement

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 in series through 220 ohm resistors.

To make this sketch work, your Arduino must be connected to your computer. Open the Serial Monitor, and send the characters a, b, c, d, or e, or anything else.

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Schematic:

Arduino Switch (case2) Statement schematic

Code

/*
Switch statement  with serial input

Demonstrates the use of a switch statement.  The switch
statement allows you to choose from among a set of discrete values
of a variable.  It’s like a series of if statements.

To see this sketch in action, open the Serial monitor and send any character.
The characters a, b, c, d, and e, will turn on LEDs.  Any other character will turn
the LEDs off.

[box color=”#985D00″ bg=”#FFF8CB” font=”verdana” fontsize=”14 ” radius=”20 ” border=”#985D12″ float=”right” head=”Major Components in Project” headbg=”#FFEB70″ headcolor=”#985D00″]

Hardware Required

  • Arduino Board
  • (5) LEDs
  • (5) 220 ohm resistors
  • breadboard
  • hook-up wire

[/box]

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