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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 987 · 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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 Digital or analog: the room temperature? (a) analog (b) digital
  3. 3.Which of these is an input? (a) a buzzer (b) a motor (c) an LED (d) a push button
  4. 4.Which of these is an input? (a) an LED (b) a small display (c) a water pump (d) a turning knob
  5. 5.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a light sensor (d) a motor
  6. 6.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) a motion sensor (d) a keypad
  7. 7.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  10. 10.True or false: “many values in a range” is an analog signal. (a) True (b) False
  11. 11.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  12. 12.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  13. 13.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
  14. 14.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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
  16. 16.True or false: “the room temperature” is an analog signal. (a) False (b) True
  17. 17.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an input? (a) a speaker (b) a sound sensor (c) a buzzer (d) a water pump
  20. 20.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔍 Which is the odd one out? (a) a keypad (b) an LED (c) a small display (d) a buzzer
  22. 22.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a sound sensor (d) a motion sensor
  23. 23.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a small display (d) a push button
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.💡 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
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  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 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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
  34. 34.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  36. 36.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  37. 37.Which of these is an output? (a) a keypad (b) a turning knob (c) a sound sensor (d) a servo motor
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: a door: open or shut? (a) analog (b) digital

Answer key

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

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