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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 706 · 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 water pump an input or an output for a microcontroller? (a) input (b) output
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a temperature sensor (d) a buzzer
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a small display (d) a turning knob
  10. 10.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a push button (d) a servo motor
  12. 12.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a motor (d) a temperature sensor
  14. 14.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.Which of these is an output? (a) a light sensor (b) a motor (c) a temperature sensor (d) a motion sensor
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a light sensor (d) a push button
  20. 20.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  21. 21.Which of these is an output? (a) a speaker (b) a push button (c) a sound sensor (d) a turning knob
  22. 22.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  23. 23.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a keypad (d) a water pump
  24. 24.📶 Digital or analog: the room temperature? (a) analog (b) digital
  25. 25.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a light sensor (d) an LED
  26. 26.💡 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
  27. 27.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a keypad (d) a servo motor
  28. 28.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  29. 29.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a buzzer (d) a keypad
  31. 31.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  32. 32.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  33. 33.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  35. 35.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  36. 36.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  37. 37.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  38. 38.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  39. 39.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  40. 40.True or false: “how bright a room is” is a digital signal. (a) True (b) False

Answer key

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

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