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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 338 · 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 input? (a) a keypad (b) an LED (c) a water pump (d) a small display
  2. 2.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  7. 7.Which of these is an output? (a) a sound sensor (b) a speaker (c) a keypad (d) a motion sensor
  8. 8.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  9. 9.💡 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 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a turning knob (d) an LED
  11. 11.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 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
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  14. 14.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  16. 16.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  19. 19.💡 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 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.True or false: “many values in a range” is an analog signal. (a) False (b) True
  21. 21.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.💡 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
  23. 23.Which of these is an output? (a) a keypad (b) a sound sensor (c) a motor (d) a push button
  24. 24.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a motor (d) an LED
  25. 25.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.💡 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) ON (b) OFF
  27. 27.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a small display (d) a keypad
  28. 28.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  29. 29.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  30. 30.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  31. 31.💡 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
  32. 32.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a servo motor (d) a small display
  33. 33.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.Which of these is an input? (a) an LED (b) a temperature sensor (c) a speaker (d) a water pump
  35. 35.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  36. 36.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  37. 37.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 Digital or analog: many values in a range? (a) digital (b) analog
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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

Answer key

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

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