Week 4 Quiz: Digital I/O Basics

Test your understanding of digital inputs and outputs

📝 10 questions covering digital pins, LEDs, buttons, and control logic

Student Information

Full Name

Email Address

Question 1: Digital Signal States

What are the two possible states of a digital signal in Arduino?

A) ON and OFF B) HIGH and LOW C) 1 and 0 D) Both B and C are correct

Question 2: Pin Configuration

Which function is used to configure a pin as an output in Arduino?

A) digitalWrite(pin, OUTPUT) B) pinMode(pin, OUTPUT) C) setPin(pin, OUTPUT) D) configPin(pin, OUTPUT)

Question 3: LED Control

To turn on an LED connected to pin 13, which command would you use?

A) digitalWrite(13, ON) B) digitalWrite(13, HIGH) C) digitalWrite(13, 1) D) Both B and C are correct

Question 4: Pull-up Resistors

What is the purpose of a pull-up resistor in digital input circuits?

A) To increase the current through the circuit B) To ensure the input pin has a defined state when not connected C) To protect the Arduino from damage D) To make the LED brighter

Question 5: Button Reading

Which function is used to read the state of a digital input pin?

A) readPin(pin) B) digitalRead(pin) C) inputRead(pin) D) getPin(pin)

Question 6: Voltage Levels

In a 5V Arduino system, what voltage represents a HIGH digital state?

A) 0V B) 2.5V C) 5V D) 3.3V

Question 7: INPUT_PULLUP

When using INPUT_PULLUP mode, what happens when a button is pressed?

A) The pin reads HIGH B) The pin reads LOW C) The pin becomes undefined D) The Arduino resets

Question 8: Code Analysis

What will this code do?
if (digitalRead(2) == LOW) digitalWrite(13, HIGH);

A) Turn on LED when button is released B) Turn on LED when button is pressed (with pull-up) C) Turn off LED when button is pressed D) This code will cause an error

Question 9: Circuit Design

Explain why you need a current-limiting resistor when connecting an LED to an Arduino pin. What could happen without it?

Question 10: Problem Solving

Describe how you would implement button debouncing in software. Why is debouncing necessary?

← Back to Week 4 Lesson

Next: Week 5 Lesson →