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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 276 · 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 8. 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
  2. 2.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an input? (a) a buzzer (b) a speaker (c) a motor (d) a temperature sensor
  4. 4.Which of these is an input? (a) an LED (b) a water pump (c) a buzzer (d) a keypad
  5. 5.Which of these is an output? (a) an LED (b) a motion sensor (c) a push button (d) a turning knob
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an output? (a) a push button (b) a servo motor (c) a motion sensor (d) a keypad
  8. 8.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a push button (c) an LED (d) a servo motor
  10. 10.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  13. 13.💡 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) OFF (b) ON
  14. 14.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  15. 15.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a servo motor (d) a small display
  16. 16.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  17. 17.Which of these is an output? (a) a water pump (b) a keypad (c) a push button (d) a temperature sensor
  18. 18.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  20. 20.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  22. 22.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  24. 24.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an output? (a) a temperature sensor (b) a push button (c) a sound sensor (d) a small display
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  30. 30.💡 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
  31. 31.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) an LED (d) a small display
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.Which of these is an input? (a) a sound sensor (b) a small display (c) an LED (d) a servo motor
  36. 36.Which of these is an input? (a) a water pump (b) a small display (c) a turning knob (d) a motor
  37. 37.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an output? (a) a keypad (b) a speaker (c) a temperature sensor (d) a light sensor
  39. 39.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “many values in a range” is a digital signal. (a) False (b) True

Answer key

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

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