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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 274 · 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.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  2. 2.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a motor (d) a light sensor
  8. 8.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a water pump (d) a turning knob
  9. 9.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  13. 13.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  14. 14.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  16. 16.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  17. 17.True or false: “many values in a range” is a digital signal. (a) False (b) True
  18. 18.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.💡 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
  20. 20.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a sound sensor (d) a push button
  22. 22.💡 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
  23. 23.📶 Digital or analog: many values in a range? (a) digital (b) analog
  24. 24.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  25. 25.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  26. 26.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  27. 27.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a temperature sensor (d) a keypad
  31. 31.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a servo motor (d) a sound sensor
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  33. 33.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a light sensor
  34. 34.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.📶 Digital or analog: the room temperature? (a) analog (b) digital
  37. 37.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a motion sensor (d) a servo motor
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  40. 40.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a keypad (d) a speaker

Answer key

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

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