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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 219 · 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.

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

Answer key

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

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