Component:
Image Reference:
Jumper Wire
Pin 9
j9
i7
Jumper Wire
GND
Jumper Wire
Piezo Buzzer
+
-
f9
f7
Arduino contains a wealth of built-in functions that are useful for all kinds of things. (See
http://arduino.cc/en/reference
for a list). But you can also easily create your
own functions. First, we need to declare a function. Here's a simple example named "add," which adds two numbers together and returns the result. Let's break it down.
Your functions can take in values ("parameters"), and return a value, as this one does.
If you'll be passing parameters to your function, put them (and their types) in the parentheses after the function name. If your function is not using any parameters, just use an empty parenthesis () after the name.
If your function is returning a value from your function, put the type of the return value in front of the function name. Then in your function, when you're ready to return the value, put in a return(value) statement. If you won't be returning a value, put "void" in front of the function name (similar to the declaration for the setup() and loop() functions).
When you write your own functions, you make your code neater and easier to re-use. See
http://arduino.cc/en/reference/functiondeclaration
for more information
about functions.
Creating your own functions:
int
add(
int
parameter1,
int
parameter2)
{
int
x;
x = para parameter2;
return
(x);
}
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