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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 89 · 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 light sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  3. 3.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  5. 5.Which of these is an input? (a) a speaker (b) an LED (c) a motor (d) a light sensor
  6. 6.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  7. 7.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: the room temperature? (a) analog (b) digital
  10. 10.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  11. 11.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  12. 12.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a motion sensor (d) a push button
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  15. 15.💡 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
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an input? (a) a small display (b) an LED (c) a turning knob (d) a speaker
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a keypad (d) a water pump
  20. 20.Which of these is an output? (a) a buzzer (b) a motion sensor (c) a turning knob (d) a keypad
  21. 21.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  22. 22.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  24. 24.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.True or false: “many values in a range” is an analog signal. (a) True (b) False
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  30. 30.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  31. 31.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) an LED (d) a light sensor
  32. 32.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an input? (a) an LED (b) a servo motor (c) a motor (d) a push button
  34. 34.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a small display (d) a temperature sensor
  35. 35.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  37. 37.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.True or false: “many values in a range” is a digital signal. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) an LED (d) a servo motor
  40. 40.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a speaker (d) a small display

Answer key

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

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