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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 965 · 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 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  3. 3.Which of these is an input? (a) a small display (b) a servo motor (c) a speaker (d) a sound sensor
  4. 4.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a water pump (d) an LED
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  6. 6.Which of these is an output? (a) a keypad (b) a temperature sensor (c) a motor (d) a motion sensor
  7. 7.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  8. 8.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  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) OFF (b) ON
  10. 10.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  12. 12.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  13. 13.Which of these is an output? (a) a motion sensor (b) a push button (c) an LED (d) a turning knob
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  16. 16.💡 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
  17. 17.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.True or false: “the room temperature” is a digital signal. (a) False (b) True
  22. 22.💡 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
  23. 23.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a light sensor (d) a small display
  24. 24.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a speaker (d) a temperature sensor
  25. 25.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  26. 26.📶 Digital or analog: the room temperature? (a) digital (b) analog
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a push button (d) a keypad
  29. 29.Which of these is an input? (a) a speaker (b) a keypad (c) a water pump (d) a buzzer
  30. 30.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  31. 31.Which of these is an output? (a) a motion sensor (b) a buzzer (c) a light sensor (d) a push button
  32. 32.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  33. 33.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 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) ON (b) OFF
  36. 36.💡 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 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a motor (d) a temperature sensor
  38. 38.💡 An LED (with its resistor) is on pin 8. 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
  39. 39.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  40. 40.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a keypad (d) a speaker

Answer key

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

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