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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 687 · 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 of these is an output? (a) a buzzer (b) a turning knob (c) a sound sensor (d) a temperature sensor
  2. 2.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  3. 3.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  4. 4.Which of these is an input? (a) a speaker (b) a servo motor (c) a turning knob (d) an LED
  5. 5.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  6. 6.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON
  7. 7.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  8. 8.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  9. 9.💡 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
  10. 10.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  13. 13.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a push button (d) an LED
  14. 14.💡 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
  15. 15.Which of these is an input? (a) a motor (b) a push button (c) an LED (d) a speaker
  16. 16.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  18. 18.Which of these is an input? (a) a buzzer (b) a motor (c) a temperature sensor (d) a water pump
  19. 19.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  21. 21.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  22. 22.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  23. 23.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a temperature sensor (d) a motor
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    set pin 7 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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  32. 32.Which of these is an input? (a) a buzzer (b) a water pump (c) a motor (d) a light sensor
  33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a temperature sensor (d) an LED
  34. 34.Which of these is an output? (a) a sound sensor (b) a keypad (c) a push button (d) a servo motor
  35. 35.💡 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 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “the room temperature” is an analog signal. (a) True (b) False
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.Which of these is an output? (a) a small display (b) a keypad (c) a sound sensor (d) a push button
  40. 40.💡 An LED (with its resistor) is on pin 7. 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

Answer key

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

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