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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 805 · 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.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an output? (a) a small display (b) a motion sensor (c) a push button (d) a keypad
  4. 4.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a servo motor (d) an LED
  6. 6.📶 Digital or analog: the room temperature? (a) digital (b) analog
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  9. 9.Which of these is an output? (a) a motor (b) a turning knob (c) a motion sensor (d) a push button
  10. 10.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  13. 13.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  14. 14.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a motion sensor (d) a turning knob
  15. 15.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  16. 16.💡 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 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a light sensor (d) a small display
  20. 20.Which of these is an input? (a) an LED (b) a motor (c) a buzzer (d) a push button
  21. 21.Which of these is an input? (a) an LED (b) a speaker (c) a keypad (d) a water pump
  22. 22.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  23. 23.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  24. 24.🔍 Which is the odd one out? (a) a turning knob (b) a speaker (c) a motor (d) an LED
  25. 25.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  27. 27.Which of these is an input? (a) a sound sensor (b) a servo motor (c) a water pump (d) a small display
  28. 28.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a turning knob (d) a light sensor
  31. 31.Which of these is an input? (a) a small display (b) a light sensor (c) a motor (d) a buzzer
  32. 32.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an input? (a) a water pump (b) an LED (c) a temperature sensor (d) a servo motor
  39. 39.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a speaker (d) a light sensor
  40. 40.Which of these is an input? (a) a motion sensor (b) an LED (c) a water pump (d) a buzzer

Answer key

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

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