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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 255 · 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 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  4. 4.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  5. 5.True or false: “many values in a range” is a digital signal. (a) False (b) True
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.Which of these is an input? (a) a water pump (b) a small display (c) a buzzer (d) a turning knob
  8. 8.📶 Digital or analog: the room temperature? (a) analog (b) digital
  9. 9.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an output? (a) a temperature sensor (b) a servo motor (c) a keypad (d) a sound sensor
  11. 11.Which of these is an output? (a) a keypad (b) a push button (c) a temperature sensor (d) a speaker
  12. 12.💡 An LED (with its resistor) is on pin 7. 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
  13. 13.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  14. 14.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a motion sensor (d) a water pump
  16. 16.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a speaker (d) a sound sensor
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a motor (d) a push button
  19. 19.🔍 Which is the odd one out? (a) a push button (b) a motor (c) a sound sensor (d) a keypad
  20. 20.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a temperature sensor (d) a keypad
  21. 21.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  22. 22.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  23. 23.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  24. 24.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a temperature sensor (d) a water pump
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a keypad (d) a motor
  31. 31.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  33. 33.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  34. 34.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  35. 35.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  36. 36.Which of these is an output? (a) a buzzer (b) a light sensor (c) a push button (d) a motion sensor
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  38. 38.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  39. 39.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a keypad (d) a light sensor
  40. 40.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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