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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 752 · 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 8. 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) OFF (b) ON
  2. 2.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  3. 3.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motor (d) a water pump
  5. 5.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  8. 8.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  9. 9.Which of these is an input? (a) a buzzer (b) a motion sensor (c) an LED (d) a servo motor
  10. 10.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  12. 12.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  13. 13.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a water pump (d) a turning knob
  14. 14.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a servo motor (d) a push button
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  16. 16.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  18. 18.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  23. 23.📶 Digital or analog: many values in a range? (a) digital (b) analog
  24. 24.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.Which of these is an input? (a) a keypad (b) a small display (c) a water pump (d) a speaker
  26. 26.🔍 Which is the odd one out? (a) a motor (b) a servo motor (c) a sound sensor (d) a water pump
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a light sensor (d) an LED
  29. 29.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a motor (d) a keypad
  30. 30.💡 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
  31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  32. 32.📶 Digital or analog: the room temperature? (a) digital (b) analog
  33. 33.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  34. 34.Which of these is an input? (a) a motor (b) a speaker (c) a buzzer (d) a turning knob
  35. 35.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a motor (d) a water pump
  37. 37.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a turning knob (d) a sound sensor
  40. 40.True or false: “many values in a range” is a digital signal. (a) False (b) True

Answer key

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

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