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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 978 · 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.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  7. 7.Which of these is an input? (a) a motor (b) a water pump (c) a push button (d) a servo motor
  8. 8.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a servo motor (d) a motion sensor
  9. 9.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) an LED (d) a push button
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  14. 14.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  15. 15.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  16. 16.True or false: “many values in a range” is an analog signal. (a) False (b) True
  17. 17.💡 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) OFF (b) ON
  18. 18.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  20. 20.Which of these is an input? (a) a servo motor (b) a motor (c) a water pump (d) a turning knob
  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 8 HIGH
    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
  22. 22.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a keypad (d) a motion sensor
  24. 24.Which of these is an input? (a) a servo motor (b) a motion sensor (c) a buzzer (d) a small display
  25. 25.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  26. 26.Which of these is an output? (a) a push button (b) a turning knob (c) a speaker (d) a temperature sensor
  27. 27.Which of these is an input? (a) a sound sensor (b) a small display (c) an LED (d) a buzzer
  28. 28.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a light sensor (d) a buzzer
  32. 32.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.💡 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 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  40. 40.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a speaker (d) a temperature sensor

Answer key

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

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