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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 104 · 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 is the odd one out? (a) a light sensor (b) a temperature sensor (c) a keypad (d) a water pump
  2. 2.Which of these is an input? (a) a motor (b) a sound sensor (c) an LED (d) a servo motor
  3. 3.📶 Digital or analog: the room temperature? (a) analog (b) digital
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  6. 6.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  11. 11.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  13. 13.🔍 Which is the odd one out? (a) a sound sensor (b) a servo motor (c) a motion sensor (d) a push button
  14. 14.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  15. 15.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an input? (a) a motor (b) a push button (c) a speaker (d) a small display
  18. 18.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a sound sensor (d) an LED
  20. 20.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  21. 21.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  22. 22.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an output? (a) a keypad (b) a light sensor (c) a motor (d) a turning knob
  25. 25.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  26. 26.Which of these is an input? (a) a speaker (b) a water pump (c) a temperature sensor (d) a motor
  27. 27.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  28. 28.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a speaker (d) a turning knob
  30. 30.True or false: “how bright a room is” is a digital 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a light sensor (d) a sound sensor
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  36. 36.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “a door: open or shut” is an analog signal. (a) True (b) False

Answer key

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

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