Arduino

Stuff from the Arduino quizzes on canvas (not ICAs)

What is an int in Arduino

A 16‑bit integer

What are the two required functions in every Arduino sketch?

setup() (runs once at start) and loop() (runs repeatedly).

What is a float in Arduino

A 32‑bit decimal (floating point) number

What symbol is used for comments in Arduino code

//

What is the purpose of the Arduino IDE "Verify" button

To compile the sketch and check for errors

What happens (to the code) when the Arduino is powered off

The last uploaded program remains in memory and runs again when powered back on

Give an example of an integer variable declaration

int alpha = 13579;

Why should you avoid long, double, or String types on Arduino Uno

They consume more memory, and Uno has limited memory (32 kB flash)

What keyword makes a variable unchangeable during execution

const

What is the difference between global and local variables

Global variables are accessible in all functions; local variables only within the function they’re declared

What does static do for a local variable

Preserves its value between function calls

Why does degC * (9/5) + 32 give the wrong result

Integer division truncates 9/5 to 1. Use floats (9./5) to fix

What does != mean

Not equal to

What is the difference between = and ==

= assigns a value; == compares values

What does i++ mean

Increment i by 1 (same as i = i + 1)

What does the following loop print

for(int i=1; i<=5; i++){ Serial.println(i); }

Numbers 1 through 5

What are the Arduino Uno analog input pins

A0–A5

What is the resolution of the Uno’s ADC

10-bit (values 0–1023)

What pin can change the ADC reference voltage

AREF

Difference between Serial.print and Serial.println

print stays on the same line; println adds a line break

What command raises a number to a power

pow(x, n);

What command reads a digital input from a pin

digitalRead(pin);

What command reads an analog voltage from a pin

analogRead(pin);