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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 267 · 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 servo motor an input or an output for a microcontroller? (a) input (b) output
  2. 2.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  3. 3.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  4. 4.Which of these is an output? (a) an LED (b) a keypad (c) a light sensor (d) a push button
  5. 5.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  6. 6.💡 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
  7. 7.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  8. 8.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a keypad (d) a servo motor
  9. 9.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  11. 11.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  12. 12.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  13. 13.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  16. 16.Which of these is an output? (a) a small display (b) a temperature sensor (c) a sound sensor (d) a light sensor
  17. 17.Which of these is an input? (a) a small display (b) a push button (c) a water pump (d) a motor
  18. 18.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  19. 19.💡 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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.Which of these is an output? (a) a motion sensor (b) a water pump (c) a sound sensor (d) a keypad
  21. 21.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a speaker (d) a small display
  23. 23.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON
  24. 24.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  25. 25.Which of these is an input? (a) a small display (b) a buzzer (c) a motion sensor (d) an LED
  26. 26.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.Which of these is an input? (a) a motor (b) a keypad (c) a servo motor (d) a water pump
  31. 31.Which of these is an output? (a) a speaker (b) a sound sensor (c) a temperature sensor (d) a light sensor
  32. 32.💡 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
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a temperature sensor (d) a push button
  35. 35.Which of these is an input? (a) a buzzer (b) a turning knob (c) a small display (d) an LED
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “many values in a range” is an analog signal. (a) True (b) False
  38. 38.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  39. 39.Which of these is an input? (a) a water pump (b) a buzzer (c) a temperature sensor (d) an LED
  40. 40.True or false: “a door: open or shut” is an analog signal. (a) False (b) True

Answer key

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

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