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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 869 · 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a keypad (d) a push button
  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 8. 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) OFF (b) ON
  8. 8.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) an LED (d) a servo motor
  11. 11.💡 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
  12. 12.Which of these is an input? (a) a servo motor (b) an LED (c) a push button (d) a motor
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a push button (d) an LED
  15. 15.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  20. 20.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a speaker (d) a sound sensor
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  23. 23.Which of these is an input? (a) a servo motor (b) a small display (c) an LED (d) a keypad
  24. 24.Which of these is an output? (a) a buzzer (b) a keypad (c) a turning knob (d) a light sensor
  25. 25.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  26. 26.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a small display (d) a speaker
  27. 27.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  28. 28.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.📶 Digital or analog: the room temperature? (a) digital (b) analog
  30. 30.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  31. 31.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a motion sensor (d) a temperature sensor
  32. 32.True or false: “many values in a range” is a digital signal. (a) True (b) False
  33. 33.Which of these is an output? (a) a turning knob (b) a speaker (c) a motion sensor (d) a push button
  34. 34.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  35. 35.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  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 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a temperature sensor (d) a light sensor
  38. 38.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  39. 39.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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