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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 412 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  2. 2.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  3. 3.True or false: “the room temperature” is a digital signal. (a) True (b) False
  4. 4.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  6. 6.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a temperature sensor (d) a small display
  7. 7.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  8. 8.Which of these is an input? (a) a push button (b) a buzzer (c) a small display (d) an LED
  9. 9.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 An LED (with its resistor) is on pin 8. 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
  11. 11.Which of these is an output? (a) a buzzer (b) a push button (c) a keypad (d) a sound sensor
  12. 12.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a motion sensor (d) a push button
  13. 13.Which of these is an input? (a) a keypad (b) a speaker (c) a small display (d) a water pump
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a water pump (d) a servo motor
  16. 16.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  18. 18.📶 Digital or analog: many values in a range? (a) analog (b) digital
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.True or false: “the room temperature” is an analog signal. (a) False (b) True
  23. 23.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an input? (a) an LED (b) a buzzer (c) a water pump (d) a light sensor
  25. 25.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  27. 27.💡 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) ON (b) OFF
  28. 28.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a temperature sensor (d) a push button
  30. 30.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  31. 31.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  32. 32.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  33. 33.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a servo motor (d) a buzzer
  35. 35.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  37. 37.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.📶 Digital or analog: the room temperature? (a) digital (b) analog
  39. 39.Which of these is an output? (a) a water pump (b) a temperature sensor (c) a motion sensor (d) a keypad
  40. 40.📶 Digital or analog: how bright a room is? (a) digital (b) analog

Answer key

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

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