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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 175 · 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 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
  2. 2.Which of these is an input? (a) a servo motor (b) a buzzer (c) a sound sensor (d) a speaker
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  6. 6.💡 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) ON (b) OFF
  7. 7.Which of these is an output? (a) a temperature sensor (b) a push button (c) a small display (d) a turning knob
  8. 8.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  9. 9.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.💡 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) ON (b) OFF
  11. 11.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  13. 13.Which of these is an output? (a) a water pump (b) a keypad (c) a motion sensor (d) a turning knob
  14. 14.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) a resistor (d) an output
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  17. 17.Which of these is an output? (a) a buzzer (b) a light sensor (c) a motion sensor (d) a turning knob
  18. 18.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  19. 19.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    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 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) OFF (b) ON
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.📶 Digital or analog: many values in a range? (a) digital (b) analog
  24. 24.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.📶 Digital or analog: the room temperature? (a) digital (b) analog
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  29. 29.True or false: “many values in a range” is an analog signal. (a) True (b) False
  30. 30.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a light sensor
  31. 31.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  32. 32.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a light sensor (d) a water pump
  33. 33.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  34. 34.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a keypad (d) a turning knob
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.Which of these is an output? (a) a push button (b) a keypad (c) a light sensor (d) a motor
  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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  40. 40.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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