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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 397 · 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 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 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a small display (d) a light sensor
  6. 6.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a keypad (d) a push button
  7. 7.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) an input (d) a resistor
  8. 8.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  9. 9.True or false: “many values in a range” is an analog signal. (a) False (b) True
  10. 10.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  11. 11.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  12. 12.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a push button (d) a turning knob
  14. 14.Which of these is an output? (a) a push button (b) a light sensor (c) a sound sensor (d) a speaker
  15. 15.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a servo motor (d) a speaker
  16. 16.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a turning knob (d) a push button
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  20. 20.💡 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 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a temperature sensor (d) a motion sensor
  23. 23.Which of these is an output? (a) a small display (b) a sound sensor (c) a push button (d) a turning knob
  24. 24.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  25. 25.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) an LED (d) a turning knob
  26. 26.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  27. 27.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a light sensor (d) a turning knob
  28. 28.Which of these is an input? (a) a motor (b) a turning knob (c) a water pump (d) an LED
  29. 29.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  30. 30.Which of these is an output? (a) an LED (b) a light sensor (c) a keypad (d) a sound sensor
  31. 31.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  32. 32.💡 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) ON (b) OFF
  33. 33.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  36. 36.💡 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
    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
  37. 37.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  38. 38.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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