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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 62 · 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.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  2. 2.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔍 Which is the odd one out? (a) a motor (b) a servo motor (c) a keypad (d) an LED
  4. 4.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  6. 6.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a speaker (d) a buzzer
  7. 7.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 An LED (with its resistor) is on pin 7. 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an input? (a) an LED (b) a servo motor (c) a buzzer (d) a keypad
  11. 11.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a motor (d) an LED
  13. 13.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  14. 14.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a motor (d) a servo motor
  16. 16.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  17. 17.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a sound sensor (d) a keypad
  18. 18.Which of these is an input? (a) an LED (b) a buzzer (c) a push button (d) a speaker
  19. 19.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  20. 20.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a servo motor (d) an LED
  21. 21.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  22. 22.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an input? (a) a motion sensor (b) an LED (c) a motor (d) a speaker
  24. 24.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.📶 Digital or analog: the room temperature? (a) digital (b) analog
  26. 26.Which of these is an output? (a) a servo motor (b) a push button (c) a light sensor (d) a keypad
  27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a motor (d) a turning knob
  29. 29.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “many values in a range” is an analog signal. (a) True (b) False
  34. 34.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a servo motor (d) a push button
  35. 35.Which of these is an input? (a) a small display (b) a buzzer (c) an LED (d) a light sensor
  36. 36.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  37. 37.Which of these is an output? (a) a temperature sensor (b) a water pump (c) a turning knob (d) a sound sensor
  38. 38.Which of these is an output? (a) a turning knob (b) a keypad (c) a buzzer (d) a light sensor
  39. 39.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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