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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 753 · 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 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    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
  2. 2.💡 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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an input? (a) a push button (b) a motor (c) a buzzer (d) a water pump
  4. 4.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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
  6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a motion sensor (d) a buzzer
  8. 8.True or false: “the room temperature” is a digital signal. (a) True (b) False
  9. 9.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a buzzer (d) a sound sensor
  11. 11.Which of these is an input? (a) a small display (b) a water pump (c) an LED (d) a turning knob
  12. 12.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  14. 14.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a motor (d) a motion sensor
  16. 16.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  17. 17.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  18. 18.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a temperature sensor (d) a servo motor
  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 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.Which of these is an output? (a) a keypad (b) a turning knob (c) a temperature sensor (d) a motor
  21. 21.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  22. 22.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a push button (d) a motion sensor
  24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  25. 25.Which of these is an output? (a) a keypad (b) a light sensor (c) a temperature sensor (d) a speaker
  26. 26.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  27. 27.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  28. 28.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  29. 29.💡 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 LOW
    set pin 8 LOW
    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 motor (b) a keypad (c) a buzzer (d) a small display
  31. 31.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  33. 33.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  34. 34.📶 Digital or analog: many values in a range? (a) analog (b) digital
  35. 35.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  36. 36.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a servo motor (d) a buzzer
  38. 38.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  39. 39.🔍 Which is the odd one out? (a) a keypad (b) a motion sensor (c) an LED (d) a sound sensor
  40. 40.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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