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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 856 · 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 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
  2. 2.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  4. 4.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  6. 6.Which of these is an input? (a) a keypad (b) a buzzer (c) a servo motor (d) a water pump
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a turning knob (d) a servo motor
  10. 10.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.Which of these is an input? (a) a servo motor (b) a speaker (c) an LED (d) a turning knob
  12. 12.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.True or false: “many values in a range” is a digital signal. (a) True (b) False
  15. 15.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a speaker (d) a motor
  16. 16.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a turning knob (d) a buzzer
  18. 18.🔍 Which is the odd one out? (a) a keypad (b) an LED (c) a water pump (d) a buzzer
  19. 19.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  20. 20.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  23. 23.Which of these is an input? (a) a small display (b) a servo motor (c) an LED (d) a push button
  24. 24.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a turning knob (d) a push button
  26. 26.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  27. 27.True or false: “many values in a range” is an analog signal. (a) False (b) True
  28. 28.Which of these is an input? (a) a motion sensor (b) a small display (c) a buzzer (d) a speaker
  29. 29.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  30. 30.📶 Digital or analog: many values in a range? (a) digital (b) analog
  31. 31.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  32. 32.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  33. 33.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  38. 38.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  39. 39.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a small display (d) a turning knob
  40. 40.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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