Week 5 Quiz: Analog Inputs & Sensors

Test your understanding of analog signals and sensor interfacing

📝 10 questions covering ADC, sensors, and data processing

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Question 1: ADC Resolution

What is the resolution of Arduino's Analog-to-Digital Converter (ADC)?

A) 8-bit (0-255) B) 10-bit (0-1023) C) 12-bit (0-4095) D) 16-bit (0-65535)

Question 2: Analog Reading Function

Which function is used to read analog values from a sensor?

A) digitalRead(pin) B) analogRead(pin) C) readAnalog(pin) D) getSensor(pin)

Question 3: Voltage Conversion

If analogRead() returns 512 on a 5V system, what voltage does this represent?

A) 1.25V B) 2.5V C) 3.75V D) 5V

Question 4: map() Function

What does this code do: int brightness = map(sensorValue, 0, 1023, 0, 255);

A) Converts sensor value to voltage B) Scales sensor value (0-1023) to PWM range (0-255) C) Adds 255 to the sensor value D) Divides sensor value by 4

Question 5: Potentiometer Wiring

In a potentiometer circuit, which pin should be connected to the analog input?

A) The pin connected to 5V B) The wiper (middle) pin C) The pin connected to ground D) Any of the three pins

Question 6: LED Current-Limiting Resistors

Why is a current-limiting resistor essential when connecting an LED to an Arduino pin?

A) To increase the LED brightness B) To protect the LED and Arduino pin from excessive current C) To change the LED color D) To make the LED blink automatically

Question 7: Data Filtering

Why is data filtering important when reading sensors?

A) To make readings faster B) To reduce noise and stabilize readings C) To increase the sensor's range D) To save memory

Question 8: Moving Average

In a moving average filter with 5 readings, what happens to the oldest reading when a new one is added?

A) It's added to the newest reading B) It's discarded and replaced C) It's stored permanently D) It's multiplied by 2

Question 9: Sensor Calibration

Explain why sensor calibration is important and describe one method to calibrate a light sensor for your specific environment.

Question 10: Voltage Divider Circuit

Describe how a voltage divider circuit works with a variable resistor (like an LDR or potentiometer) to create varying analog signals for the Arduino to read.

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