MIDTERM EXAMINATION ELXTECH 213 EMBEDDED SYSTEMS

Which microcontroller family does the ESP32 belong to?

• AVR

• ARM Cortex M0

• Xtensa

• PIC

What feature makes ESP32 ideal for IoT?

• Built-in WiFi and Bluetooth

• Built-in relay control

• Uses 5V logic only

• Requires a sound module

The function tone(pin, frequency, duration) is used to control what component?

• Servo motor

• Piezo buzzer

• Relay coil

• HC-06 module

In the mobile app controlled servo motor activity, what data does the HC-06 Bluetooth module send to the Arduino to control the servo?

• A voltage reference that rotates the servo automatically

• An angle value that determines the servo position

• Binary audio signals from the microphone

• WiFi credentials for pairing

In generating melodies using Arduino, changing frequency affects:

• Loudness

• Pitch

• Voltage

• Delay

A relay isolates which two circuits?

• Two grounds

• Low-voltage and high-voltage

• Two high-voltage lines

• Internet networks

ESP32 typically operates at:

• 12V

• 9V

• 5V logic

• 3.3V logic

Which mobile app type controls the servo wirelessly?

• QR scanner

• Bluetooth servo controller

• Voice translator

• GPS mapper

A relay in these activities controls:

• 5V only

• 220VAC

• 12V battery only

• 3.3V only

Bluetooth baud rate used in servo activity:

• 4800

• 9600

• 115200

• 2400