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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 476 · 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 LOW
    set pin 7 HIGH
    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 push button (b) a speaker (c) a buzzer (d) a servo motor
  3. 3.💡 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) OFF (b) ON
  4. 4.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 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
    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
  8. 8.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a turning knob (d) a sound sensor
  9. 9.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  10. 10.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  11. 11.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.Which of these is an input? (a) a buzzer (b) a small display (c) a turning knob (d) an LED
  13. 13.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a speaker (d) a light sensor
  14. 14.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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) ON (b) OFF
  17. 17.💡 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 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  22. 22.Which of these is an input? (a) an LED (b) a speaker (c) a servo motor (d) a temperature sensor
  23. 23.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  24. 24.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  25. 25.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  26. 26.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  27. 27.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  29. 29.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  31. 31.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a servo motor (d) a buzzer
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  33. 33.True or false: “the room temperature” is an analog signal. (a) True (b) False
  34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  35. 35.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an input? (a) a keypad (b) a water pump (c) a buzzer (d) a motor
  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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  39. 39.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  40. 40.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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