Conditionals (if)

Overview

Conditionals offer a way for your code to make decisions. In the real world, an example of a conditional might be, if it is cold put on a sweater. A conditional in code looks like the following (see below). In this code the condition x == 5 is evaluated. If it true, the code inside the curly braces runds. NOTE: the double equals sign is used when comparing two values.

if (x == 5) {                //Checks if this condition is true (i.e. does x equal 5). Note double equals sign
    Serial.print("true");    //If the condition is true than any lines of code placed between the two curly braces are executed.

}

In addtion to checking if two values are equal, you came make a variety of comparisons using the relational operators shown below.

Relational Operator

Description

Example

==

is equal to

x == 5

>

is greater than

x > 5

<

is less than

x < 5

>=

is greater than or equal to

x >= 5

<=

is less than or equal to

x <= 5

!=

is not equal to

x != 5

Challenge

  1. Write a program that includes a variable slowly increasing in value. Print the value to your serial monitor. When then variable reaches a set value, you should print “true” in your serial monitor.

  2. Modify your program so that the monitor displays “true” when the value is below your set point and “false” when above your set point.

  3. Connect pin 6 to ground via a long jump wire. Modify your program to print “true” if pin 6 is connected to power.

TEACHER CHECK ____