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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 994 · 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.Which of these is an output? (a) a motion sensor (b) a keypad (c) an LED (d) a temperature sensor
  2. 2.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  3. 3.Which of these is an input? (a) a speaker (b) a servo motor (c) a small display (d) a light sensor
  4. 4.💡 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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  6. 6.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  10. 10.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a turning knob (d) a motor
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  13. 13.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a push button (d) an LED
  15. 15.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a servo motor (d) a motor
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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
  18. 18.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a turning knob (d) a speaker
  19. 19.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  20. 20.💡 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  22. 22.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  23. 23.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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
    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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a motor (d) a turning knob
  27. 27.💡 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
  28. 28.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a water pump (d) a push button
  29. 29.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  30. 30.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  32. 32.💡 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
  33. 33.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  34. 34.Which of these is an input? (a) a water pump (b) a speaker (c) a push button (d) an LED
  35. 35.Which of these is an output? (a) a keypad (b) a water pump (c) a turning knob (d) a push button
  36. 36.🔍 Which is the odd one out? (a) a turning knob (b) a small display (c) a temperature sensor (d) a sound sensor
  37. 37.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  38. 38.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a servo motor (d) a motion sensor

Answer key

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

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