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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 719 · 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.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  3. 3.Which of these is an input? (a) an LED (b) a small display (c) a servo motor (d) a keypad
  4. 4.Which of these is an input? (a) a sound sensor (b) a buzzer (c) a water pump (d) a speaker
  5. 5.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a motor (d) a light sensor
  6. 6.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  7. 7.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a speaker (d) a light sensor
  8. 8.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  9. 9.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a light sensor (b) a speaker (c) a servo motor (d) a water pump
  11. 11.Which of these is an output? (a) a push button (b) a temperature sensor (c) a sound sensor (d) a speaker
  12. 12.🔍 Which is the odd one out? (a) a speaker (b) a temperature sensor (c) an LED (d) a buzzer
  13. 13.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  17. 17.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  18. 18.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a light sensor (d) an LED
  22. 22.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  23. 23.Which of these is an output? (a) a buzzer (b) a turning knob (c) a sound sensor (d) a keypad
  24. 24.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a turning knob (d) a water pump
  25. 25.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a sound sensor (d) an LED
  26. 26.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) a temperature sensor (d) a push button
  28. 28.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  29. 29.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  31. 31.Which of these is an input? (a) an LED (b) a buzzer (c) a turning knob (d) a small display
  32. 32.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  33. 33.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  34. 34.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  36. 36.Which of these is an input? (a) a speaker (b) a small display (c) a light sensor (d) a buzzer
  37. 37.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  38. 38.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  39. 39.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  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 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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