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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 229 · 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 turning knob (b) an LED (c) a sound sensor (d) a keypad
  2. 2.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a turning knob (d) a push button
  3. 3.💡 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) ON (b) OFF
  4. 4.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a temperature sensor (d) a speaker
  5. 5.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  6. 6.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a water pump (d) a turning knob
  7. 7.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a buzzer (d) a water pump
  9. 9.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a temperature sensor (d) a sound sensor
  11. 11.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  13. 13.Which of these is an output? (a) a light sensor (b) a push button (c) a buzzer (d) a turning knob
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  15. 15.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  17. 17.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  18. 18.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  19. 19.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 An LED (with its resistor) is on pin 7. 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) OFF (b) ON
  21. 21.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  22. 22.True or false: “the room temperature” is an analog signal. (a) True (b) False
  23. 23.Which of these is an output? (a) a servo motor (b) a push button (c) a keypad (d) a turning knob
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) a push button (d) an LED
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  29. 29.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a light sensor (d) a keypad
  30. 30.💡 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
  31. 31.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a motor (d) a sound sensor
  32. 32.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a motor (c) a light sensor (d) a keypad
  34. 34.💡 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
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an input? (a) a motor (b) a speaker (c) a keypad (d) a buzzer
  37. 37.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  38. 38.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  39. 39.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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