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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 514 · 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.Which of these is an input? (a) a buzzer (b) a speaker (c) a light sensor (d) a servo motor
  3. 3.Which of these is an input? (a) a buzzer (b) a servo motor (c) a motion sensor (d) a water pump
  4. 4.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  7. 7.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an output? (a) an LED (b) a push button (c) a keypad (d) a light sensor
  10. 10.True or false: “a button: pressed or not” 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 LOW
    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
  12. 12.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  13. 13.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a push button (d) a sound sensor
  14. 14.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  16. 16.💡 An LED (with its resistor) is on pin 8. 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
  17. 17.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a buzzer (d) a light sensor
  18. 18.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  19. 19.💡 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) OFF (b) ON
  20. 20.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 Digital or analog: many values in a range? (a) digital (b) analog
  22. 22.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  23. 23.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  24. 24.Which of these is an output? (a) a light sensor (b) a push button (c) a servo motor (d) a motion sensor
  25. 25.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 5 V (d) 1.5 V
  26. 26.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
  27. 27.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a turning knob (d) a small display
  28. 28.Which of these is an output? (a) a push button (b) a motor (c) a temperature sensor (d) a keypad
  29. 29.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  30. 30.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  31. 31.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  33. 33.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  34. 34.Which of these is an input? (a) a water pump (b) a buzzer (c) a temperature sensor (d) a servo motor
  35. 35.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) an LED (d) a light sensor
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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