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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 850 · 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an output? (a) a speaker (b) a push button (c) a motion sensor (d) a temperature sensor
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.📶 Digital or analog: the room temperature? (a) analog (b) digital
  6. 6.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a buzzer (d) a turning knob
  7. 7.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a keypad (d) a water pump
  8. 8.Which of these is an output? (a) a push button (b) an LED (c) a temperature sensor (d) a keypad
  9. 9.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  11. 11.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 5 V (d) 9 V
  13. 13.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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
  15. 15.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  16. 16.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  18. 18.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  19. 19.Which of these is an input? (a) an LED (b) a buzzer (c) a turning knob (d) a motor
  20. 20.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a light sensor (d) a motor
  21. 21.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a sound sensor (d) a small display
  22. 22.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  23. 23.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) an LED (d) a push button
  26. 26.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  28. 28.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  29. 29.Which of these is an input? (a) a temperature sensor (b) a small display (c) a speaker (d) a motor
  30. 30.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  31. 31.Which of these is an input? (a) an LED (b) a small display (c) a light sensor (d) a speaker
  32. 32.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a tilt switch: on or off? (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 8 HIGH
    set pin 8 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
  37. 37.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an output? (a) a sound sensor (b) a servo motor (c) a light sensor (d) a turning knob
  39. 39.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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