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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 815 · 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.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  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
    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
  3. 3.Which of these is an output? (a) a keypad (b) a push button (c) a light sensor (d) a motor
  4. 4.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a servo motor (d) a speaker
  6. 6.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  7. 7.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a buzzer (d) a light sensor
  8. 8.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a servo motor (d) a keypad
  10. 10.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 Digital or analog: the room temperature? (a) digital (b) analog
  13. 13.True or false: “the room temperature” is a digital signal. (a) False (b) True
  14. 14.Which of these is an input? (a) a water pump (b) a speaker (c) a small display (d) a temperature sensor
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  17. 17.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a small display (d) a water pump
  18. 18.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  19. 19.True or false: “many values in a range” is a digital signal. (a) False (b) True
  20. 20.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  21. 21.Which of these is an input? (a) a sound sensor (b) a buzzer (c) an LED (d) a small display
  22. 22.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  23. 23.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) a water pump (d) a temperature sensor
  24. 24.💡 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
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  29. 29.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a water pump (d) an LED
  31. 31.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  32. 32.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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
  34. 34.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  35. 35.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  36. 36.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  37. 37.📶 Digital or analog: many values in a range? (a) digital (b) analog
  38. 38.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “a door: open or shut” is an analog signal. (a) False (b) True

Answer key

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

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