Arduino Cheat Sheet

A Programming › C cheat sheet in English by Knoddy

Basic Arduino functions and their use cases.

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PRs

Variables

Strings	`String variableName = "Text in here";`
Integers	`int variableName = 0;`
Doubles	`double variableName = 0.1;`
Longs	`long variableName = 999999999;`
Booleans	`boolean variableName = false;`

You can also create empty variables by default by omitting the equals sign.
For example, String variableName; will create a new empty String variable.

Arrays

Array that can hold 4 Strings	`string[4] array;`
Array with pre-set content	`string[3] array = {"Banana", "Orange", "Apple"}`
Access the n^th value of an array	`array[n-1];`
Assign a value to an array	`array[n-1] = "Pear";`

Changing Values

Create a new String variable	`String variableName;`
Assign "Pear" to the variable	`variableName = "Pear";`

This method works for other variable types, too. Keep in mind of the data type that you are assigning to a variable, though. You cannot assign "Pear" to an int, for example.

While Loops

While loops will repeatedly run the code inside it until the condition is false, in which the loop will stop and the code after it will continue.

while (condition) {
// code here
}

Functions

Declare a function	`void myFunc() // code here }`
Declare a function that returns an `int`	`int myFunc(){ return 1; }`
Declare a function that takes a String parameter	`void myFunc(String param) { // code here }`
Store the return value of a function in a variable	`int variableName = myFunc();`

Combine these concepts to create different types of functions that suit your needs. You can have a function that returns an int value with a String parameter, for example. Use void if your function doesn't return anything.

Arduino

Set digital pin `n` to INPUT.	`pinMode(n, INPUT);`
Set digital pin `n` to OUTPUT.	`pinMode(n, OUTPUT);`
Read digital pin `n` (returns boolean)	`digitalRead(n);`
Write to digital pin `n` (LOW or HIGH)	`digitalWrite(n, LOW);`
Read value of analog pin A0 (returns int)	`analogRead(A0);`

Motor

Create a new motor plugged into port M1	`Adafruit_DCMotor *myMotor = AFMS.getMotor(1);`
Set speed of a motor (0-255)	`motor->setSpeed(100);`
Change motor direction (FORWARD, BACKWARD, RELEASE)	`motor->run(FORWARD);`

Encoder

Create a new encoder plugged in pins 2 and 3	`Encoder myEncoder(2, 3);`
Read encoder (returns long)	`Encoder.read();`
Write to encoder	`Encoder.write(0);`

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