Decision making

In the Arduino programming language, we make decisions with the if statement. The if statement will check if a condition is true and if so will execute the block of code within the curly brackets.

The following shows the syntax for the if statement:

if (condition) {
  // Code to execute
}

We can use an else statement after the if statement to execute a block of code if the condition is not true.

The following shows the syntax for the if/else statement:

if (condition) {
  // Code to execute if condition is true
} else {
  // Code to execute if condition is false
}

The condition, in the if statement, can be any Boolean value or an operation that returns a Boolean result. You will find that the majority of the if statements in your code will contain comparison operations. Let's look at some code that will illustrate this:

if (varA > varB) {
  Serial.println...