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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 97 · 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.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  2. 2.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  3. 3.Which of these is an input? (a) a buzzer (b) a push button (c) a speaker (d) a servo motor
  4. 4.Which of these is an output? (a) a keypad (b) a push button (c) a temperature sensor (d) a servo motor
  5. 5.💡 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
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  7. 7.🔍 Which is the odd one out? (a) a servo motor (b) a speaker (c) a motor (d) a motion sensor
  8. 8.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an input? (a) an LED (b) a buzzer (c) a speaker (d) a turning knob
  10. 10.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  11. 11.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  13. 13.Which of these is an input? (a) an LED (b) a speaker (c) a small display (d) a keypad
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    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 temperature sensor (b) a buzzer (c) a light sensor (d) a keypad
  16. 16.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a motion sensor (d) a temperature sensor
  17. 17.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  18. 18.Which of these is an input? (a) a motor (b) a water pump (c) an LED (d) a temperature sensor
  19. 19.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 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
  21. 21.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  22. 22.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a servo motor (d) a temperature sensor
  23. 23.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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) ON (b) OFF
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a temperature sensor (d) a push button
  27. 27.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a motor (d) a push button
  28. 28.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.📶 Digital or analog: many values in a range? (a) digital (b) analog
  35. 35.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  36. 36.Which of these is an input? (a) a small display (b) an LED (c) a motor (d) a motion sensor
  37. 37.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  38. 38.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  39. 39.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a speaker
  40. 40.Which of these is an output? (a) an LED (b) a light sensor (c) a keypad (d) a temperature sensor

Answer key

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

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