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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 447 · 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.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  2. 2.Which of these is an input? (a) a speaker (b) a small display (c) a motor (d) a turning knob
  3. 3.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  4. 4.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.True or false: “many values in a range” is a digital signal. (a) True (b) False
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  7. 7.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a sound sensor (d) a motion sensor
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a sound sensor (d) a small display
  10. 10.Which of these is an output? (a) a keypad (b) a servo motor (c) a sound sensor (d) a temperature sensor
  11. 11.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a sound sensor (d) a temperature sensor
  12. 12.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a push button (d) a keypad
  13. 13.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  14. 14.Which of these is an input? (a) a buzzer (b) a speaker (c) a keypad (d) an LED
  15. 15.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a small display (d) a servo motor
  16. 16.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  23. 23.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a motor (d) a speaker
  24. 24.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an output? (a) a buzzer (b) a keypad (c) a light sensor (d) a push button
  29. 29.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a buzzer (d) a temperature sensor
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  33. 33.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) a resistor (d) an output
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a servo motor (d) a temperature sensor
  36. 36.💡 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) ON (b) OFF
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a small display (d) a keypad

Answer key

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

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