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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 373 · 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 temperature sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  4. 4.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a motor (d) a small display
  5. 5.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  6. 6.Which of these is an input? (a) a buzzer (b) a sound sensor (c) a small display (d) a speaker
  7. 7.Which of these is an input? (a) a water pump (b) a servo motor (c) a speaker (d) a turning knob
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  11. 11.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a temperature sensor (d) a speaker
  12. 12.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  13. 13.Which of these is an output? (a) a keypad (b) an LED (c) a sound sensor (d) a motion sensor
  14. 14.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  15. 15.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  16. 16.Which of these is an input? (a) a buzzer (b) an LED (c) a small display (d) a temperature sensor
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  19. 19.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a speaker (d) a buzzer
  22. 22.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  23. 23.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 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) a push button (c) a water pump (d) a light sensor
  25. 25.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  26. 26.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  30. 30.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  31. 31.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a speaker (d) a turning knob
  32. 32.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  33. 33.Which of these is an input? (a) a light sensor (b) a servo motor (c) a small display (d) an LED
  34. 34.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  35. 35.Which of these is an input? (a) an LED (b) a keypad (c) a motor (d) a speaker
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a sound sensor (d) a speaker
  38. 38.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.💡 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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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