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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 452 · 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: the room temperature? (a) analog (b) digital
  2. 2.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a small display (d) a turning knob
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  5. 5.Which of these is an input? (a) a water pump (b) a push button (c) an LED (d) a servo motor
  6. 6.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a speaker
  7. 7.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  8. 8.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a servo motor (d) a sound sensor
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an output? (a) a turning knob (b) a buzzer (c) a temperature sensor (d) a push button
  11. 11.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  13. 13.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a sound sensor (d) a push button
  14. 14.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  15. 15.True or false: “many values in a range” is an analog signal. (a) False (b) True
  16. 16.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.Which of these is an output? (a) an LED (b) a motion sensor (c) a light sensor (d) a turning knob
  20. 20.💡 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
  21. 21.📶 Digital or analog: many values in a range? (a) digital (b) analog
  22. 22.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an output? (a) a motion sensor (b) a push button (c) a motor (d) a temperature sensor
  24. 24.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a push button (d) an LED
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  27. 27.🔌 Is a servo motor 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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an input? (a) an LED (b) a motor (c) a turning knob (d) a servo motor
  30. 30.💡 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
  31. 31.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  32. 32.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  33. 33.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a push button (d) a water pump
  35. 35.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an output? (a) a light sensor (b) a water pump (c) a temperature sensor (d) a keypad
  37. 37.Which of these is an input? (a) a servo motor (b) an LED (c) a small display (d) a light sensor
  38. 38.Which of these is an input? (a) a sound sensor (b) a buzzer (c) a small display (d) a motor
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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