Embedded System Design ELE4423 Slides Review Quiz

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What is the purpose of modifying the code to blink the LED at a higher frequency?

To decrease the power consumption of the LED

To slow down the blinking rate for better visibility

To make the blinking effect of the LED imperceptible to human eyes (correct)

To increase the overall brightness of the LED

Why is it recommended to write the LED blinking code inside the loop() function?

To ensure the LED state changes periodically (correct)

To increase power efficiency of the LED

To reduce code complexity

To improve LED brightness

What is the significance of using a scope when coding the LED ON/OFF signal?

To change the pin configuration of the LED

To verify that the code is generating the intended ON/OFF signal (correct)

To measure the power consumption of the LED

To directly control the LED brightness levels

Why is it better to use a higher frequency for blinking the LED?

To ensure faster ON and OFF times resulting in imperceptible blinking Signup and view all the answers

What design requirement is fulfilled by controlling scrolling LEDs (chasing LEDs)?

Turning ON LEDs one by one with a time delay in between Signup and view all the answers

Why does C language for Arduino use static typing?

To improve memory management and execution efficiency Signup and view all the answers

What formula can be used to convert the value from the ADC back into the output voltage of the sensor?

VOUT = reading from ADC * (Vref / 1024) Signup and view all the answers

What is the resolution obtained from the ADC when using the default reference voltage of the Arduino for analog input?

4.88 mV or 0.49°C Signup and view all the answers

How can the precision of temperature readings be improved when using the Arduino?

By changing the reference voltage to 1.1 V Signup and view all the answers

What is an electric motor defined as?

A machine that converts electrical energy into mechanical energy Signup and view all the answers

What is the interaction that drives motors?

Between the magnetic field and electric current in a coil winding Signup and view all the answers

What function can be used to change the reference voltage to improve precision in temperature measurement?

analogReference() Signup and view all the answers

What is the main purpose of using PWM in controlling the speed of a brushed DC motor?

To change the voltage applied to the motor armature Signup and view all the answers

Why can't the Arduino or any microcontroller directly reduce the pin voltage to control the speed of a DC motor?

The pins can only output digital signals Signup and view all the answers

In PWM, what does the term 'Pulse Width' refer to?

The proportion of time the signal is ON over a period Signup and view all the answers

Which component is crucial for applying the PWM signal to control a brushed DC motor?

Transistor Signup and view all the answers

How does PWM help in reducing the speed of a brushed DC motor?

By reducing the average voltage applied to the motor Signup and view all the answers

What effect does applying a PWM signal to a DC motor have on its speed?

Reduces its speed by altering the applied voltage Signup and view all the answers

What is the main focus of Lab 5 in the embedded system design course?

Keypad/LCD/UART Signup and view all the answers

Which topic is covered in the lecture during Week 6 of the embedded system design course?

RTOS Signup and view all the answers

What does the abbreviation 'UART' stand for in the context of embedded systems?

Universal Asynchronous Receiver Transmitter Signup and view all the answers

Which activity is NOT part of Lab 10 in the embedded system design course?

Working with Ultrasonic Sensor Signup and view all the answers

What is the primary focus of Lecture 14 in the embedded system design course?

DHT11/22 sensor, one wire protocol Signup and view all the answers

What is the definition of an embedded system based on the information provided?

An electronic programmed and operating system for dedicated tasks within a larger system Signup and view all the answers

What distinguishes stepper motors from normal DC motors?

Stepper motors have multiple 'toothed' electromagnets arranged around a central metal gear. Signup and view all the answers

In a unipolar stepper motor, how are the electromagnets activated?

Sequentially, in a repeating pattern of coil activation. Signup and view all the answers

What determines the step angle of a stepper motor?

The distance between teeth of the 'toothed' electromagnets. Signup and view all the answers

What is the purpose of having multiple 'toothed' electromagnets in a stepper motor?

To divide a full rotation into a large number of steps. Signup and view all the answers

How do stepper motors differ from normal DC motors when voltage is applied to their terminals?

Stepper motors move in steps while DC motors simply spin. Signup and view all the answers

What is the primary difference between bi-polar and unipolar arrangements of electromagnetic coils in stepper motors?

Unipolar stepper motors have separate coils for each electromagnet, while bi-polar motors use shared coils. Signup and view all the answers