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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 538 · 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 HIGH
    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
  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 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  5. 5.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  6. 6.Which of these is an input? (a) a keypad (b) a servo motor (c) an LED (d) a speaker
  7. 7.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  11. 11.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  12. 12.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  13. 13.📶 Digital or analog: many values in a range? (a) digital (b) analog
  14. 14.Which of these is an output? (a) a motion sensor (b) a small display (c) a sound sensor (d) a keypad
  15. 15.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a temperature sensor (d) a turning knob
  16. 16.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  19. 19.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a water pump (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 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) ON (b) OFF
  21. 21.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  22. 22.Which of these is an input? (a) a motion sensor (b) an LED (c) a small display (d) a buzzer
  23. 23.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) a speaker (d) a turning knob
  24. 24.True or false: “the room temperature” is a digital signal. (a) True (b) False
  25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a motor (c) a keypad (d) a light sensor
  26. 26.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  27. 27.Which of these is an input? (a) a small display (b) a speaker (c) an LED (d) a light sensor
  28. 28.💡 An LED (with its resistor) is on pin 7. 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
  29. 29.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a turning knob (d) a speaker
  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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a motion sensor (d) a motor
  33. 33.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.Which of these is an output? (a) a temperature sensor (b) a motor (c) a keypad (d) a turning knob
  36. 36.Which of these is an input? (a) a servo motor (b) a small display (c) a temperature sensor (d) an LED
  37. 37.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  38. 38.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  40. 40.💡 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

Answer key

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

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