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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 384 · 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 is the odd one out? (a) a sound sensor (b) a light sensor (c) a water pump (d) a push button
  2. 2.📶 Digital or analog: the room temperature? (a) digital (b) analog
  3. 3.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a small display (d) a water pump
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a push button (d) a motor
  6. 6.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a small display (d) a buzzer
  8. 8.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  9. 9.Which of these is an output? (a) a keypad (b) a sound sensor (c) a motor (d) a motion sensor
  10. 10.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.Which of these is an input? (a) a buzzer (b) a servo motor (c) a temperature sensor (d) an LED
  12. 12.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  13. 13.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  14. 14.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.Which of these is an output? (a) a small display (b) a temperature sensor (c) a sound sensor (d) a motion sensor
  16. 16.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  17. 17.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.💡 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
  20. 20.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  21. 21.Which of these is an output? (a) a speaker (b) a turning knob (c) a sound sensor (d) a keypad
  22. 22.🔍 Which is the odd one out? (a) a small display (b) a motion sensor (c) a temperature sensor (d) a light sensor
  23. 23.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 HIGH
    set pin 7 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 a digital signal. (a) True (b) False
  30. 30.📶 Digital or analog: many values in a range? (a) analog (b) digital
  31. 31.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  32. 32.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  33. 33.Which of these is an input? (a) an LED (b) a motor (c) a push button (d) a water pump
  34. 34.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a turning knob (d) a buzzer
  36. 36.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a small display (d) a buzzer
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  39. 39.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: a door: open or shut? (a) digital (b) analog

Answer key

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

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