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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 933 · 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 motion sensor (b) a push button (c) a sound sensor (d) a water pump
  2. 2.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  5. 5.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a push button (d) an LED
  7. 7.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  8. 8.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  9. 9.Which of these is an input? (a) an LED (b) a turning knob (c) a buzzer (d) a servo motor
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  11. 11.Which of these is an output? (a) a turning knob (b) a servo motor (c) a keypad (d) a sound sensor
  12. 12.Which of these is an output? (a) a speaker (b) a turning knob (c) a light sensor (d) a motion sensor
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  15. 15.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  17. 17.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a speaker (d) an LED
  18. 18.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  19. 19.🔍 Which is the odd one out? (a) a temperature sensor (b) a turning knob (c) a sound sensor (d) an LED
  20. 20.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  21. 21.Which of these is an output? (a) a light sensor (b) an LED (c) a keypad (d) a sound sensor
  22. 22.💡 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
  23. 23.💡 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 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  28. 28.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  29. 29.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  30. 30.True or false: “many values in a range” is a digital signal. (a) False (b) True
  31. 31.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  35. 35.💡 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
  36. 36.💡 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 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.Which of these is an input? (a) a water pump (b) a small display (c) an LED (d) a push button
  38. 38.Which of these is an input? (a) a servo motor (b) a speaker (c) an LED (d) a light sensor
  39. 39.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  40. 40.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a sound sensor (d) a small display

Answer key

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

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