IoT & Embedded Systems Basics
IoT stands for:
Internet of Things
The ESP32 is best described as a:
Microcontroller with built-in WiFi and Bluetooth
A sensor's main function is to:
Detect/measure a physical quantity and convert it to an electrical signal
A digital signal has how many possible states?
2
MQTT is best described as a:
Lightweight publish-subscribe messaging protocol
An embedded system is best described as:
A computer system dedicated to a specific task within a larger device
GPIO stands for:
General Purpose Input/Output
Which of the following is a temperature and humidity sensor?
DHT22
Unlike a digital signal, an analog signal can:
Take a continuous range of values
In MQTT, the entity that manages and routes messages between devices is called the:
Broker
Which of the following is a core component of a typical IoT system?
Sensor
Which IDE is commonly used to program the ESP32 in this course?
Arduino IDE
PWM stands for:
Pulse Width Modulation
How many main signal lines does I²C use (excluding power and ground)?
2
In an MQTT system, a device that sends out data is called a:
Publisher
A key difference between embedded systems and general-purpose computers is that embedded systems are:
Designed for a specific, dedicated function
A GPIO pin configured as an OUTPUT can be used to:
Drive an LED or other actuator
An LDR is used to detect:
Light intensity
In I²C communication, SDA stands for:
Serial Data
A device that receives MQTT data by listening to a topic is called a:
Subscriber
Which of the following is an example of an actuator in an IoT system?
Servo motor
What is the typical logic-level voltage of the ESP32's GPIO pins?
3.3V
PWM is commonly used to control:
A servo motor's position or an LED's brightness
What tool is used to detect connected I²C devices and their addresses?
An I²C scanner sketch
MQTT messages are organized and routed using:
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