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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 375 · 40 questions
TalentJR

Remember (Read in, drive out): Inputs: buttons, knobs, sensors. Outputs: LEDs, buzzers, motors, displays. Digital: HIGH (≈ 5 V) or LOW (0 V) only. Analog: any value in a range. Trace the program: only the LED’s own pin matters, and its last command decides ON or OFF.

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  1. 1.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a sound sensor (d) a water pump
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  5. 5.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a small display (d) a buzzer
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  8. 8.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a sound sensor (b) a motion sensor (c) an LED (d) a temperature sensor
  10. 10.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  11. 11.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a temperature sensor (d) a light sensor
  12. 12.True or false: “the room temperature” is a digital signal. (a) False (b) True
  13. 13.Which of these is an input? (a) a motor (b) a keypad (c) a servo motor (d) a small display
  14. 14.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
  15. 15.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a sound sensor (d) a motion sensor
  16. 16.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.Which of these is an input? (a) a motor (b) a buzzer (c) a turning knob (d) a speaker
  19. 19.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  20. 20.📶 Digital or analog: many values in a range? (a) analog (b) digital
  21. 21.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an output? (a) a sound sensor (b) an LED (c) a temperature sensor (d) a light sensor
  25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a speaker (d) a push button
  31. 31.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  35. 35.📶 Digital or analog: the room temperature? (a) digital (b) analog
  36. 36.Which of these is an output? (a) a motion sensor (b) a small display (c) a keypad (d) a light sensor
  37. 37.Which of these is an input? (a) a push button (b) a buzzer (c) a small display (d) an LED
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

  1. input
  2. a water pump
  3. 5 V
  4. input
  5. a keypad
  6. OFF
  7. input
  8. analog
  9. an LED
  10. output
  11. a small display
  12. False
  13. a keypad
  14. an input
  15. a motor
  16. input
  17. ON
  18. a turning knob
  19. True
  20. analog
  21. digital
  22. OFF
  23. OFF
  24. an LED
  25. ON
  26. OFF
  27. False
  28. ON
  29. False
  30. a push button
  31. analog
  32. ON
  33. output
  34. digital
  35. analog
  36. a small display
  37. a push button
  38. OFF
  39. output
  40. ON

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