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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 656 · 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a sound sensor (b) a servo motor (c) an LED (d) a small display
  3. 3.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  4. 4.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  5. 5.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  8. 8.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  9. 9.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an output? (a) a push button (b) a speaker (c) a turning knob (d) a sound sensor
  11. 11.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  13. 13.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  14. 14.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an output? (a) a push button (b) a motor (c) a light sensor (d) a turning knob
  18. 18.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.Which of these is an input? (a) a light sensor (b) a small display (c) a servo motor (d) an LED
  20. 20.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  21. 21.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  24. 24.True or false: “the room temperature” is a digital signal. (a) True (b) False
  25. 25.💡 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
    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
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a small display (b) a motion sensor (c) a push button (d) a sound sensor
  29. 29.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  30. 30.True or false: “the room temperature” is an analog signal. (a) True (b) False
  31. 31.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an output? (a) a motion sensor (b) a keypad (c) an LED (d) a temperature sensor
  33. 33.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 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) OFF (b) ON
  35. 35.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  36. 36.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) an LED (d) a motor
  37. 37.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: how loud a sound is? (a) digital (b) analog

Answer key

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

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