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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 689 · 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 of these is an output? (a) a keypad (b) a sound sensor (c) a servo motor (d) a turning knob
  2. 2.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a motion sensor (d) a servo motor
  3. 3.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  4. 4.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a turning knob (c) an LED (d) a motion sensor
  6. 6.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  7. 7.Which of these is an input? (a) a buzzer (b) a motor (c) a small display (d) a push button
  8. 8.Which of these is an output? (a) a push button (b) a small display (c) a keypad (d) a turning knob
  9. 9.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a motor (d) a servo motor
  10. 10.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  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 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a push button (d) a speaker
  13. 13.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 Digital or analog: many values in a range? (a) analog (b) digital
  16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  17. 17.💡 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 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  20. 20.Which of these is an output? (a) a push button (b) a buzzer (c) a temperature sensor (d) a light sensor
  21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  22. 22.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) a turning knob (b) a servo motor (c) a temperature sensor (d) a keypad
  24. 24.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a water pump (d) a light sensor
  25. 25.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  37. 37.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a keypad (d) a sound sensor
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital

Answer key

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

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