Arduino Math Functions: Absolute Value Quiz and Flashcards

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Questions and Answers

What is the primary purpose of user-defined functions?

To communicate with devices over the USB port using a serial communication protocol

To allow programmers to divide a complex code into a simpler one

To reduce the chances of errors in a program

To increase the readability of code by performing a specific task (correct)

What is the benefit of using functions in a program?

It increases the chances of errors in a program

It makes the program more complex and difficult to understand

It reduces the chances of errors and makes the program more compact (correct)

It divides a simple code into a complex one

What is the purpose of the Serial.begin(speed) function in Arduino?

To prepare Arduino to begin sending and receiving serial data (correct)

To perform mathematical operations

To define a user-defined function

To divide a complex code into a simpler one

What does the min(x, y) function return in Arduino?

The smaller of x and y Signup and view all the answers

What is the maximum speed of serial communication in Arduino, typically?

115,200 bps Signup and view all the answers

What does the abs(x) function return in Arduino?

The absolute value of x Signup and view all the answers

What is the purpose of the randomSeed() function in Arduino?

To reset Arduino's pseudorandom number generator Signup and view all the answers

What is the return value of the random() function when called with a single argument?

A random long integer value between 0 and the specified max - 1 Signup and view all the answers

What is the purpose of the millis() function in Arduino?

To return the number of milliseconds since the sketch started Signup and view all the answers

What is the purpose of the constrain function in programming?

To restrict a value within a specified range Signup and view all the answers

What is the difference between the delay() and delayMicroseconds() functions in Arduino?

delay() pauses the program for milliseconds, while delayMicroseconds() pauses for microseconds Signup and view all the answers

What is the main benefit of using the map function?

To convert a value from one range to another Signup and view all the answers

What is the purpose of the tan() function in Arduino?

To compute the tangent of a given angle Signup and view all the answers

What is the difference between the pow and sqrt functions?

The pow function returns the result of raising a number to a power, while the sqrt function returns the square root of a number Signup and view all the answers

What is the purpose of the abs function?

To return the absolute value of a number Signup and view all the answers

What is the purpose of the analogRead() function in Arduino?

To read the value of an analog input pin Signup and view all the answers

What is the difference between the sin and cos functions?

The sin function returns the sine of an angle, while the cos function returns the cosine of an angle Signup and view all the answers

What is the purpose of the tan function?

To return the tangent of an angle specified in radians Signup and view all the answers

Study Notes

User-Defined Functions

User-defined functions are developed by the user to perform specific tasks according to their requirements.
These functions require a proper definition to be written by the user.

Benefits of Using Functions

Increases the readability of the code
Conceives and organizes the program
Reduces the chances of errors
Makes the program compact and small
Avoids the repetition of the set of statements or codes
Allows programmers to divide a complex code or program into a simpler one
Modification becomes easier with the help of functions in a program

Arduino Sketch Program Built-in Functions

Serial Communication

Used to communicate with devices over the USB port using a serial communication protocol
Serial.begin(speed) prepares Arduino to begin sending and receiving serial data
Generally uses 9600 bits per second (bps) with the Arduino IDE serial monitor, but other speeds are available, usually no more than 115,200 bps

Math Functions

min(x, y) returns the smaller of x and y
max(x, y) returns the larger of x and y
abs(x) returns the absolute value of x, which turns negative numbers into positive
constrain(var, min, max) returns the value of var, constrained between min and max
map(var, min_old, max_old, min_new, max_new) converts a var value in the range min_old and max_old to the new range min_new and max_new
pow(base, exponent) returns the result of raising a number (base) to a value (exponent)
sqrt(x) returns the square root of a number
sin(rad) returns the sine of an angle specified in radians
cos(rad) returns the cosine of an angle specified in radians
tan(rad) returns the tangent of an angle specified in radians

Random Number Functions

randomSeed(seed) resets Arduino’s pseudorandom number generator
random(max) returns a pseudorandom long integer value between 0 and max – 1
random(min, max) returns a pseudorandom long integer value between min and max – 1

Time Functions

millis() returns the number of milliseconds that have passed since the sketch started
delay(ms) pauses the program for the amount of milliseconds specified
delayMicroseconds(us) pauses the program for the given amount of microseconds

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Description

Test your understanding of math functions in Arduino, including absolute values, constraining values, and mapping ranges. Learn how to use these functions to control your projects.