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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 931 · 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 speaker (b) a small display (c) a motor (d) a turning knob
  2. 2.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a turning knob (d) a motor
  3. 3.True or false: “many values in a range” is an analog signal. (a) True (b) False
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.Which of these is an output? (a) a buzzer (b) a sound sensor (c) a motion sensor (d) a temperature sensor
  6. 6.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  7. 7.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a water pump (d) a light sensor
  8. 8.Which of these is an input? (a) a sound sensor (b) an LED (c) a buzzer (d) a servo motor
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  10. 10.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  11. 11.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a servo motor (d) a keypad
  13. 13.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  14. 14.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  16. 16.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  17. 17.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) an LED (d) a motion sensor
  18. 18.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  19. 19.Which of these is an output? (a) a light sensor (b) a push button (c) a motion sensor (d) an LED
  20. 20.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  21. 21.Which of these is an output? (a) a keypad (b) a water pump (c) a light sensor (d) a sound sensor
  22. 22.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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) ON (b) OFF
  23. 23.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  24. 24.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  25. 25.Which of these is an input? (a) a small display (b) a water pump (c) a motion sensor (d) a motor
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  28. 28.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a water pump (d) a motor
  29. 29.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  33. 33.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  35. 35.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  36. 36.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  37. 37.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an input? (a) a speaker (b) an LED (c) a water pump (d) a temperature sensor

Answer key

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

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