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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 900 · 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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an output? (a) a motor (b) a push button (c) a motion sensor (d) a turning knob
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  5. 5.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  6. 6.📶 Digital or analog: many values in a range? (a) analog (b) digital
  7. 7.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔍 Which is the odd one out? (a) a turning knob (b) a speaker (c) a push button (d) a keypad
  9. 9.Which of these is an output? (a) a motion sensor (b) a turning knob (c) an LED (d) a temperature sensor
  10. 10.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  14. 14.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  15. 15.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  17. 17.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a sound sensor (d) a motion sensor
  18. 18.Which of these is an output? (a) a speaker (b) a keypad (c) a light sensor (d) a sound sensor
  19. 19.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  20. 20.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  21. 21.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a keypad (b) a motion sensor (c) a servo motor (d) a temperature sensor
  23. 23.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an input? (a) a buzzer (b) a servo motor (c) a motion sensor (d) a speaker
  25. 25.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “many values in a range” is a digital signal. (a) True (b) False
  29. 29.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  30. 30.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.Which of these is an input? (a) a buzzer (b) a motor (c) a push button (d) a servo motor
  32. 32.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a temperature sensor (d) an LED
  35. 35.💡 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
    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
  36. 36.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  37. 37.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  38. 38.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  39. 39.Which of these is an input? (a) a speaker (b) a turning knob (c) a servo motor (d) a water pump
  40. 40.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a small display (d) a light sensor

Answer key

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

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