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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 608 · 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.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a turning knob (d) a buzzer
  2. 2.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  3. 3.Which of these is an input? (a) a buzzer (b) a motor (c) a push button (d) a water pump
  4. 4.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  6. 6.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) an input (d) a resistor
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a buzzer (d) a motor
  9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
  10. 10.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.Which of these is an input? (a) a servo motor (b) a water pump (c) a small display (d) a light sensor
  12. 12.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  18. 18.True or false: “the room temperature” is an analog signal. (a) True (b) False
  19. 19.Which of these is an input? (a) a temperature sensor (b) a water pump (c) a servo motor (d) a buzzer
  20. 20.🔍 Which is the odd one out? (a) a motion sensor (b) an LED (c) a light sensor (d) a turning knob
  21. 21.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  22. 22.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  24. 24.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  25. 25.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  26. 26.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.Which of these is an input? (a) a keypad (b) a speaker (c) a motor (d) a buzzer
  28. 28.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a push button (d) a buzzer
  33. 33.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  34. 34.Which of these is an output? (a) a keypad (b) a temperature sensor (c) a light sensor (d) a buzzer
  35. 35.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a speaker (d) a temperature sensor
  36. 36.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  39. 39.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  40. 40.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a speaker (d) a turning knob

Answer key

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

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