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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 432 · 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 input? (a) a water pump (b) a light sensor (c) an LED (d) a buzzer
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  3. 3.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a push button (d) a motion sensor
  4. 4.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a motor (d) a keypad
  5. 5.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) an LED (d) a keypad
  6. 6.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  7. 7.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  8. 8.📶 Digital or analog: HIGH or LOW only? (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 8 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 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a light sensor (d) a temperature sensor
  12. 12.Which of these is an output? (a) a keypad (b) a sound sensor (c) a buzzer (d) a push button
  13. 13.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  14. 14.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a speaker (d) a temperature sensor
  15. 15.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a motor (d) a servo motor
  16. 16.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a push button 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
    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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  25. 25.Which of these is an input? (a) an LED (b) a keypad (c) a water pump (d) a speaker
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  28. 28.💡 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) OFF (b) ON
  29. 29.Which of these is an input? (a) a push button (b) a small display (c) a speaker (d) a water pump
  30. 30.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  31. 31.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  32. 32.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an input? (a) an LED (b) a water pump (c) a speaker (d) a sound sensor
  34. 34.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a speaker (d) a keypad
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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