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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 827 · 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 motor (c) an LED (d) a motion sensor
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a motion sensor (d) a servo motor
  3. 3.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  7. 7.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  8. 8.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  9. 9.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  10. 10.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a small display (d) a keypad
  11. 11.Which of these is an input? (a) a temperature sensor (b) a small display (c) a speaker (d) a motor
  12. 12.💡 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) OFF (b) ON
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  15. 15.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    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
  22. 22.💡 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 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.Which of these is an output? (a) a buzzer (b) a push button (c) a motion sensor (d) a light sensor
  24. 24.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an input? (a) a water pump (b) a motor (c) a small display (d) a turning knob
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  28. 28.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  29. 29.🔌 Is a speaker 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 HIGH
    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
  31. 31.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  32. 32.Which of these is an input? (a) a water pump (b) an LED (c) a motor (d) a light sensor
  33. 33.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a buzzer (d) a push button
  36. 36.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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