Data Sheet

34 : circuit 1d

CODE TO NOTE

ANALOG OUTPUT (PWM):

analogWrite(RedPin, 100);

The analogWrite() function outputs a voltage between

0 and 5V on a pin. The function breaks the range

between 0 and 5V into 255 little steps. Note that we are

not turning the LED on to full brightness (255) in this

code so that the night-light is not too bright. Feel free to

change these values and see what happens.

NESTED IF STATEMENTS:

if(logic statement){

}

A nested if statement is one or more if statements

“nested” inside of another if statement. If the parent

if statement is true, then the code looks at each of the

nested if statements and executes any that are true. If

the parent if statement is false, then none of the nested

statements will execute.

MORE LOGICAL

OPERATORS:

(potentiometer > 0 &&

potentiometer <= 150)

These if statements are checking for two conditions

by using the AND && operator. In this line, the if

statement will only be true if the value of the variable

potentiometer is greater than 0 AND if the value is less

than or equal to 150. By using &&, the program allows the

LED to have many color states.

DEFINING A FUNCTION:

void function_name(){

}

This is a definition of a simple function. When

programmers want to use many lines of code over and

over again, they write a function. The code inside the

curly brackets “executes” whenever the function is

“called” in the main program. Each of the colors for the

RGB LED is defined in a function.

CALLING A FUNCTION:

function_name();

This line “calls” a function that you have created.

In a later circuit, you will learn how to make more

complicated functions that take data from the main

program (these pieces of data are called parameters).

SIK v4 Book Oct 13.indb 34 10/18/17 9:59 AM