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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 555 · 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 Digital or analog: the room temperature? (a) digital (b) analog
  4. 4.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  5. 5.True or false: “many values in a range” is an analog signal. (a) False (b) True
  6. 6.Which of these is an output? (a) an LED (b) a turning knob (c) a light sensor (d) a push button
  7. 7.Which of these is an output? (a) a sound sensor (b) a push button (c) a buzzer (d) a temperature sensor
  8. 8.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a keypad (d) a light sensor
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a sound sensor (d) a motion sensor
  11. 11.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an input? (a) a water pump (b) a sound sensor (c) a small display (d) an LED
  13. 13.💡 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) ON (b) OFF
  14. 14.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  15. 15.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a servo motor (d) a temperature sensor
  16. 16.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  17. 17.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  22. 22.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) a light sensor (d) a push button
  24. 24.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  25. 25.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  28. 28.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an input? (a) a servo motor (b) an LED (c) a water pump (d) a push button
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  31. 31.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  35. 35.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  36. 36.Which of these is an input? (a) a keypad (b) a speaker (c) a small display (d) a motor
  37. 37.📶 Digital or analog: many values in a range? (a) analog (b) digital
  38. 38.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a water pump (d) a light sensor
  39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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