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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 497 · 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 input? (a) a water pump (b) a small display (c) a turning knob (d) a buzzer
  2. 2.💡 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
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  4. 4.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  5. 5.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a servo motor (d) a light sensor
  6. 6.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a temperature sensor (d) a speaker
  7. 7.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  8. 8.Which of these is an output? (a) a temperature sensor (b) an LED (c) a turning knob (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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.Which of these is an input? (a) an LED (b) a small display (c) a light sensor (d) a servo motor
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  13. 13.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a sound sensor (d) a push button
  14. 14.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  16. 16.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a sound sensor (d) a speaker
  17. 17.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) a push button (d) a sound sensor
  18. 18.💡 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) OFF (b) ON
  19. 19.💡 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
  20. 20.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  23. 23.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  24. 24.Which of these is an input? (a) a buzzer (b) a servo motor (c) a sound sensor (d) an LED
  25. 25.Which of these is an input? (a) a push button (b) an LED (c) a water pump (d) a speaker
  26. 26.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  27. 27.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
  29. 29.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  34. 34.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  35. 35.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  36. 36.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  37. 37.True or false: “many values in a range” is a digital signal. (a) True (b) False
  38. 38.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  39. 39.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  40. 40.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True

Answer key

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

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