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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 314 · 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 speaker (b) a motor (c) a servo motor (d) a sound sensor
  2. 2.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 5 V (d) 1.5 V
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) an LED (d) a push button
  5. 5.Which of these is an output? (a) a push button (b) a motion sensor (c) a light sensor (d) a speaker
  6. 6.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a keypad (d) a speaker
  7. 7.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  8. 8.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  10. 10.📶 Digital or analog: the room temperature? (a) analog (b) digital
  11. 11.Which of these is an output? (a) a push button (b) a small display (c) a motion sensor (d) a sound sensor
  12. 12.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  13. 13.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  14. 14.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  17. 17.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  18. 18.Which of these is an input? (a) a buzzer (b) a motion sensor (c) a water pump (d) an LED
  19. 19.💡 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a servo motor (d) a temperature sensor
  23. 23.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  26. 26.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.Which of these is an output? (a) a keypad (b) a temperature sensor (c) a push button (d) a servo motor
  28. 28.True or false: “many values in a range” is an analog signal. (a) False (b) True
  29. 29.📶 Digital or analog: many values in a range? (a) analog (b) digital
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.True or false: “many values in a range” is a digital signal. (a) False (b) True
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  33. 33.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  35. 35.Which of these is an input? (a) a servo motor (b) a motor (c) a turning knob (d) a water pump
  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 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔍 Which is the odd one out? (a) a keypad (b) a speaker (c) a temperature sensor (d) a push button
  39. 39.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  40. 40.📶 Digital or analog: a door: open or shut? (a) analog (b) digital

Answer key

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

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