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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 595 · 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.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  2. 2.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an input? (a) a servo motor (b) a small display (c) a sound sensor (d) a water pump
  4. 4.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  5. 5.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  6. 6.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  8. 8.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) an LED (d) a small display
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a sound sensor (d) a temperature sensor
  11. 11.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  12. 12.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  13. 13.Which of these is an output? (a) a push button (b) a turning knob (c) a keypad (d) a water pump
  14. 14.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  15. 15.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a motor (d) a sound sensor
  16. 16.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  17. 17.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a buzzer (d) a keypad
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  19. 19.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a light sensor (d) a temperature sensor
  20. 20.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an input? (a) a servo motor (b) a buzzer (c) a motor (d) a keypad
  24. 24.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
  27. 27.📶 Digital or analog: HIGH or LOW only? (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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) an LED (d) a motion sensor
  31. 31.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  32. 32.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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
  36. 36.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a small display (d) a water pump
  37. 37.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  40. 40.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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