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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 184 · 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 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  3. 3.Which of these is an input? (a) a buzzer (b) a speaker (c) an LED (d) a push button
  4. 4.True or false: “many values in a range” is an analog signal. (a) False (b) True
  5. 5.Which of these is an output? (a) a turning knob (b) a light sensor (c) a temperature sensor (d) an LED
  6. 6.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  7. 7.Which of these is an input? (a) an LED (b) a small display (c) a buzzer (d) a motion sensor
  8. 8.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a motion sensor
  9. 9.💡 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
  10. 10.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.Which of these is an input? (a) a buzzer (b) an LED (c) a temperature sensor (d) a water pump
  12. 12.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a sound sensor (d) a motor
  14. 14.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  15. 15.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  16. 16.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  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 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
  18. 18.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  19. 19.Which of these is an output? (a) a sound sensor (b) a push button (c) a small display (d) a temperature sensor
  20. 20.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  22. 22.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a keypad (d) a push button
  23. 23.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a light sensor (d) a temperature sensor
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an output? (a) a motor (b) a temperature sensor (c) a sound sensor (d) a keypad
  27. 27.Which of these is an input? (a) a small display (b) a speaker (c) an LED (d) a turning knob
  28. 28.📶 Digital or analog: many values in a range? (a) analog (b) digital
  29. 29.💡 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
    set pin 8 HIGH
    set pin 7 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  32. 32.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  33. 33.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) an LED (d) a buzzer
  35. 35.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  36. 36.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  37. 37.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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