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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 840 · 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 water pump (b) a turning knob (c) a buzzer (d) a motor
  2. 2.Which of these is an input? (a) a small display (b) a speaker (c) a water pump (d) a push button
  3. 3.Which of these is an input? (a) a sound sensor (b) a small display (c) a buzzer (d) a servo motor
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.Which of these is an input? (a) an LED (b) a buzzer (c) a servo motor (d) a temperature sensor
  7. 7.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  8. 8.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a temperature sensor (d) a buzzer
  9. 9.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a motor (d) a light sensor
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a motor (d) a buzzer
  12. 12.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 Digital or analog: many values in a range? (a) analog (b) digital
  14. 14.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  16. 16.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  18. 18.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  19. 19.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) a push button (b) a small display (c) a keypad (d) a motion sensor
  24. 24.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  26. 26.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔍 Which is the odd one out? (a) a motion sensor (b) an LED (c) a keypad (d) a push button
  29. 29.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a buzzer (d) an LED
  30. 30.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  31. 31.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  32. 32.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  33. 33.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  34. 34.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  35. 35.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an input? (a) a small display (b) a speaker (c) an LED (d) a light sensor
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a push button (d) a servo motor
  40. 40.🔍 Which is the odd one out? (a) a turning knob (b) a speaker (c) a push button (d) a light sensor

Answer key

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

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