Embedded Systems and Programming Quiz

A student wants to control an LED light using a light sensor (LDR). The main component of the embedded system that is most appropriate to use is:

• Modem and motion sensor

• Arduino Uno and LDR

• Laptop and webcam

• Printer and USB cable

• Tablet and camera

In an automatic irrigation system, the microcontroller reads the soil moisture and turns on the water pump. What should be done when the moisture value is below the threshold?

• Store data to the computer

• Activate the water pump through digital output

• Stop reading the sensor

• Turn on the indicator LED only

• Turn off the system completely

If a temperature sensor LM35 outputs 0.5V at 50°C, how to read this value using a microcontroller?

• Use digitalRead()

• Use analogRead() and convert voltage

• Use digitalWrite()

• Use delay()

• Use pinMode()

A technician designs an automatic street light control system based on a light sensor. The main components that need to be configured in the code are:

• HDMI and LAN ports

• Sensor input pins and relay output pins

• RAM and GPU

• Operating system and antivirus

• Keyboard and mouse

In a home automation system, if the door is open, the alarm sounds. The programming logic that needs to be applied is:

• Infinite looping

• If-else condition based on sensor input

• GUI interface graphics

• Two-dimensional array structure

• Recursive function

What is the function of the following program for Arduino: int led = 13; void setup() { pinMode(led, OUTPUT); } void loop() { digitalWrite(led, HIGH); delay(1000); digitalWrite(led, LOW); delay(1000); }

• Turn on the LED for 5 seconds then off

• Make the LED blink every 1 second

• Read input from the sensor

• Control a DC motor

• Measure room temperature

To read values from an analog temperature sensor to Arduino, the correct code is:

• digitalRead(A0);

• digitalWrite(A0, HIGH);

• analogRead(A0);

• delay(A0);

• pinMode(A0, OUTPUT);

In embedded programming, the function pinMode(pin, OUTPUT); is used to:

• Read analog values

• Set the pin as output

• Store data to EEPROM

• Create time delay

• Display graphics

If you want to activate the motor when the temperature is above 30°C, the programming structure used is:

• for loop

• while loop

• if statement

• switch statement

• goto

What is the purpose of the following program: int sensor = analogRead(A1); if (sensor < 300) { digitalWrite(8, HIGH); } else { digitalWrite(8, LOW); }

• Store sensor data

• Turn on output if sensor value is low

• Display data graphics

• Deactivate analog pin

• Set communication baud rate