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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 977 · 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 speaker an input or an output for a microcontroller? (a) output (b) input
  2. 2.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  3. 3.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  4. 4.True or false: “the room temperature” is a digital signal. (a) True (b) False
  5. 5.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
  6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  8. 8.Which of these is an input? (a) a buzzer (b) a water pump (c) an LED (d) a sound sensor
  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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an input? (a) an LED (b) a water pump (c) a motor (d) a keypad
  13. 13.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a speaker (d) a buzzer
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  18. 18.True or false: “many values in a range” is an analog signal. (a) True (b) False
  19. 19.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a servo motor (d) a motion sensor
  20. 20.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a small display (d) a buzzer
  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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  24. 24.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  25. 25.Which of these is an output? (a) an LED (b) a motion sensor (c) a push button (d) a light sensor
  26. 26.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a small display (d) a motion sensor
  28. 28.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  29. 29.Which of these is an output? (a) a turning knob (b) a keypad (c) a push button (d) a small display
  30. 30.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  32. 32.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  33. 33.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  34. 34.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  35. 35.Which of these is an input? (a) a motor (b) a motion sensor (c) a buzzer (d) an LED
  36. 36.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  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 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
  38. 38.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a buzzer (d) a temperature sensor
  39. 39.📶 Digital or analog: the room temperature? (a) analog (b) digital
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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