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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 305 · 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: a door: open or shut? (a) analog (b) digital
  2. 2.💡 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) OFF (b) ON
  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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  5. 5.Which of these is an output? (a) a turning knob (b) a speaker (c) a push button (d) a light sensor
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  11. 11.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  12. 12.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 Digital or analog: the room temperature? (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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an input? (a) a turning knob (b) a motor (c) a servo motor (d) a buzzer
  18. 18.💡 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) OFF (b) ON
  19. 19.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  20. 20.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  21. 21.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  22. 22.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  23. 23.Which of these is an input? (a) a buzzer (b) a speaker (c) a motor (d) a temperature sensor
  24. 24.Which of these is an input? (a) a speaker (b) a small display (c) a keypad (d) a buzzer
  25. 25.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “many values in a range” is an analog signal. (a) True (b) False
  27. 27.Which of these is an input? (a) an LED (b) a light sensor (c) a motor (d) a small display
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “many values in a range” is a digital signal. (a) False (b) True
  31. 31.Which of these is an input? (a) a speaker (b) a push button (c) an LED (d) a water pump
  32. 32.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  33. 33.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a light sensor (d) a small display
  38. 38.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.Which of these is an output? (a) a temperature sensor (b) a push button (c) a small display (d) a sound sensor
  40. 40.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a temperature sensor (d) a keypad

Answer key

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

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