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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 806 · 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.Which of these is an input? (a) a small display (b) a push button (c) an LED (d) a buzzer
  5. 5.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  6. 6.Which of these is an output? (a) a temperature sensor (b) a water pump (c) a turning knob (d) a keypad
  7. 7.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.💡 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) OFF (b) ON
  9. 9.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  10. 10.Which of these is an input? (a) a water pump (b) an LED (c) a sound sensor (d) a motor
  11. 11.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) an LED (d) a motion sensor
  12. 12.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  13. 13.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  14. 14.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  15. 15.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) an LED (d) a water pump
  18. 18.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  21. 21.Which of these is an input? (a) a light sensor (b) a buzzer (c) a servo motor (d) a water pump
  22. 22.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  24. 24.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a turning knob (d) a buzzer
  25. 25.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  26. 26.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  30. 30.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  31. 31.Which of these is an input? (a) a keypad (b) a motor (c) an LED (d) a buzzer
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  34. 34.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 Digital or analog: many values in a range? (a) digital (b) analog
  36. 36.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
  37. 37.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  38. 38.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a turning knob (d) a push button
  39. 39.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  40. 40.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a keypad (d) a servo motor

Answer key

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

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