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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 454 · 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.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  4. 4.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  5. 5.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a push button (d) a temperature sensor
  6. 6.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “many values in a range” is an analog signal. (a) False (b) True
  8. 8.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  10. 10.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  15. 15.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a push button (d) a motor
  17. 17.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  18. 18.📶 Digital or analog: many values in a range? (a) analog (b) digital
  19. 19.Which of these is an output? (a) a sound sensor (b) a keypad (c) a water pump (d) a temperature sensor
  20. 20.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  21. 21.📶 Digital or analog: the room temperature? (a) analog (b) digital
  22. 22.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  24. 24.Which of these is an input? (a) an LED (b) a motion sensor (c) a motor (d) a small display
  25. 25.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  26. 26.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  28. 28.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  30. 30.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  31. 31.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a light sensor (d) a motor
  32. 32.True or false: “many values in a range” is a digital signal. (a) False (b) True
  33. 33.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a small display (d) a push button
  34. 34.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an input? (a) a water pump (b) a small display (c) a keypad (d) a motor
  37. 37.True or false: “the room temperature” is a digital signal. (a) True (b) False
  38. 38.Which of these is an input? (a) a small display (b) a push button (c) a buzzer (d) a servo motor
  39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an output? (a) a push button (b) a buzzer (c) a motion sensor (d) a temperature sensor

Answer key

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

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