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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 948 · 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.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔍 Which is the odd one out? (a) a keypad (b) a temperature sensor (c) a motor (d) a sound sensor
  3. 3.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  4. 4.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  5. 5.💡 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) ON (b) OFF
  6. 6.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  9. 9.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  11. 11.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  12. 12.💡 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) ON (b) OFF
  13. 13.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  14. 14.Which of these is an input? (a) an LED (b) a small display (c) a servo motor (d) a temperature sensor
  15. 15.Which of these is an input? (a) a buzzer (b) a speaker (c) a push button (d) a water pump
  16. 16.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) an LED (d) a servo motor
  17. 17.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  18. 18.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  20. 20.Which of these is an output? (a) a turning knob (b) a push button (c) an LED (d) a light sensor
  21. 21.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a keypad (d) a buzzer
  22. 22.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a motion sensor (d) a keypad
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an output? (a) a sound sensor (b) a water pump (c) a push button (d) a keypad
  25. 25.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a water pump (d) a temperature sensor
  29. 29.Which of these is an output? (a) a speaker (b) a sound sensor (c) a motion sensor (d) a light sensor
  30. 30.Which of these is an output? (a) a keypad (b) a light sensor (c) a small display (d) a push button
  31. 31.Which of these is an input? (a) a turning knob (b) a buzzer (c) a water pump (d) a speaker
  32. 32.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an input? (a) a speaker (b) a light sensor (c) a buzzer (d) a servo motor
  34. 34.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.📶 Digital or analog: the room temperature? (a) digital (b) analog
  37. 37.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  38. 38.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  39. 39.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.Which of these is an output? (a) a servo motor (b) a keypad (c) a push button (d) a turning knob

Answer key

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

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