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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 216 · 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 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 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
  2. 2.Which of these is an input? (a) a water pump (b) a motor (c) a servo motor (d) a temperature sensor
  3. 3.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  4. 4.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  5. 5.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  6. 6.Which of these is an input? (a) a small display (b) a speaker (c) a push button (d) a motor
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a temperature sensor (d) a water pump
  10. 10.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a small display (d) a push button
  12. 12.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  14. 14.Which of these is an output? (a) a push button (b) a keypad (c) a sound sensor (d) a motor
  15. 15.📶 Digital or analog: many values in a range? (a) analog (b) digital
  16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.💡 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
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) an LED (d) a buzzer
  23. 23.📶 Digital or analog: the room temperature? (a) analog (b) digital
  24. 24.🔍 Which is the odd one out? (a) a keypad (b) a water pump (c) a sound sensor (d) a light sensor
  25. 25.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  26. 26.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  27. 27.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  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 7 LOW
    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
  29. 29.💡 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) ON (b) OFF
  30. 30.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a sound sensor (c) a turning knob (d) a keypad
  33. 33.💡 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
  34. 34.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a light sensor (d) a motion sensor
  35. 35.Which of these is an input? (a) a speaker (b) a turning knob (c) a small display (d) a buzzer
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  39. 39.💡 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
  40. 40.True or false: “many values in a range” is an analog signal. (a) True (b) False

Answer key

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

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