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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 306 · 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.Which of these is an input? (a) a motor (b) a turning knob (c) a speaker (d) a servo motor
  2. 2.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a buzzer (d) a turning knob
  3. 3.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  4. 4.💡 An LED (with its resistor) is on pin 8. 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
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.True or false: “many values in a range” is a digital signal. (a) True (b) False
  7. 7.Which of these is an input? (a) a speaker (b) an LED (c) a buzzer (d) a motion sensor
  8. 8.Which of these is an output? (a) a push button (b) a small display (c) a temperature sensor (d) a sound sensor
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  10. 10.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  11. 11.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a small display (d) a push button
  12. 12.True or false: “the room temperature” is a digital signal. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) a servo motor (b) a keypad (c) a small display (d) an LED
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) an LED (d) a keypad
  17. 17.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a motor (d) a keypad
  18. 18.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.🔍 Which is the odd one out? (a) a speaker (b) a temperature sensor (c) a light sensor (d) a keypad
  20. 20.Which of these is an input? (a) a keypad (b) a speaker (c) an LED (d) a buzzer
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  23. 23.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.Which of these is an output? (a) a push button (b) a temperature sensor (c) a light sensor (d) a water pump
  27. 27.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  28. 28.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  30. 30.Which of these is an input? (a) a small display (b) a speaker (c) a sound sensor (d) a buzzer
  31. 31.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a push button (d) a light sensor
  32. 32.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a push button (b) a keypad (c) an LED (d) a turning knob
  34. 34.📶 Digital or analog: many values in a range? (a) analog (b) digital
  35. 35.Which of these is an input? (a) an LED (b) a light sensor (c) a buzzer (d) a water pump
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  38. 38.💡 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) ON (b) OFF
  39. 39.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

  1. a turning knob
  2. a turning knob
  3. output
  4. OFF
  5. ON
  6. False
  7. a motion sensor
  8. a small display
  9. 5 V
  10. False
  11. a push button
  12. False
  13. a keypad
  14. ON
  15. ON
  16. an LED
  17. a motor
  18. input
  19. a speaker
  20. a keypad
  21. OFF
  22. 0 V
  23. OFF
  24. ON
  25. input
  26. a water pump
  27. True
  28. analog
  29. False
  30. a sound sensor
  31. a water pump
  32. ON
  33. an LED
  34. analog
  35. a light sensor
  36. ON
  37. analog
  38. OFF
  39. output
  40. OFF

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