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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 821 · 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  3. 3.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a sound sensor (d) a push button
  4. 4.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a motion sensor (d) a buzzer
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  7. 7.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  8. 8.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  9. 9.Which of these is an output? (a) a motor (b) a light sensor (c) a sound sensor (d) a push button
  10. 10.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  11. 11.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  14. 14.Which of these is an input? (a) a light sensor (b) a speaker (c) a water pump (d) a motor
  15. 15.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a light sensor (d) a speaker
  16. 16.Which of these is an output? (a) a servo motor (b) a turning knob (c) a push button (d) a motion sensor
  17. 17.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motion sensor (d) a push button
  19. 19.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a push button (d) a buzzer
  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) 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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “many values in a range” is a digital signal. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a water pump (d) a light sensor
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a small display (d) a keypad
  28. 28.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  32. 32.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 Digital or analog: many values in a range? (a) analog (b) digital
  35. 35.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a motor (d) an LED
  36. 36.Which of these is an input? (a) a buzzer (b) a turning knob (c) a motor (d) a speaker
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔍 Which is the odd one out? (a) a servo motor (b) a sound sensor (c) a keypad (d) a motion sensor
  40. 40.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital

Answer key

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

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