Embedded System Design ELE4423 Slides Review Quiz
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Questions and Answers

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?

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

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

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

    Why does C language for Arduino use static typing?

    <p>To improve memory management and execution efficiency</p> 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?

    <p>VOUT = reading from ADC * (Vref / 1024)</p> 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?

    <p>4.88 mV or 0.49°C</p> Signup and view all the answers

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

    <p>By changing the reference voltage to 1.1 V</p> Signup and view all the answers

    What is an electric motor defined as?

    <p>A machine that converts electrical energy into mechanical energy</p> Signup and view all the answers

    What is the interaction that drives motors?

    <p>Between the magnetic field and electric current in a coil winding</p> Signup and view all the answers

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

    <p>analogReference()</p> Signup and view all the answers

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

    <p>To change the voltage applied to the motor armature</p> 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?

    <p>The pins can only output digital signals</p> Signup and view all the answers

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

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

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

    <p>Transistor</p> Signup and view all the answers

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

    <p>By reducing the average voltage applied to the motor</p> Signup and view all the answers

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

    <p>Reduces its speed by altering the applied voltage</p> Signup and view all the answers

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

    <p>Keypad/LCD/UART</p> Signup and view all the answers

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

    <p>RTOS</p> Signup and view all the answers

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

    <p>Universal Asynchronous Receiver Transmitter</p> Signup and view all the answers

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

    <p>Working with Ultrasonic Sensor</p> Signup and view all the answers

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

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

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

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

    What distinguishes stepper motors from normal DC motors?

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

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

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

    What determines the step angle of a stepper motor?

    <p>The distance between teeth of the 'toothed' electromagnets.</p> Signup and view all the answers

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

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

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

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

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

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

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