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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 707 · 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 water pump an input or an output for a microcontroller? (a) input (b) output
  2. 2.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  10. 10.Which of these is an output? (a) a motor (b) a push button (c) a keypad (d) a sound sensor
  11. 11.Which of these is an output? (a) a turning knob (b) a push button (c) a small display (d) a sound sensor
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  13. 13.Which of these is an input? (a) a water pump (b) a buzzer (c) a motor (d) a turning knob
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  16. 16.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a speaker (d) a small display
  18. 18.Which of these is an input? (a) a buzzer (b) a motor (c) a motion sensor (d) a water pump
  19. 19.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  20. 20.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a push button (d) a water pump
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a water pump
  23. 23.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.📶 Digital or analog: a tilt switch: on or off? (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 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a light sensor (d) an LED
  28. 28.💡 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) ON (b) OFF
  29. 29.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  30. 30.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  31. 31.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  32. 32.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.Which of these is an input? (a) a speaker (b) an LED (c) a small display (d) a push button
  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 8 HIGH
    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
  35. 35.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) an LED (d) a buzzer
  36. 36.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  38. 38.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  40. 40.📶 Digital or analog: many values in a range? (a) analog (b) digital

Answer key

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

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