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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 892 · 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 8. All pins start LOW. The program runs once:
    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
  2. 2.Which of these is an input? (a) a motor (b) a small display (c) an LED (d) a temperature sensor
  3. 3.Which of these is an input? (a) a sound sensor (b) a motor (c) an LED (d) a small display
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  8. 8.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  10. 10.Which of these is an output? (a) a light sensor (b) a turning knob (c) a water pump (d) a motion sensor
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a small display
  15. 15.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a temperature sensor (d) an LED
  16. 16.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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 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.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  19. 19.Which of these is an output? (a) a push button (b) a speaker (c) a sound sensor (d) a light sensor
  20. 20.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.Which of these is an input? (a) a speaker (b) a light sensor (c) a small display (d) a motor
  23. 23.Which of these is an input? (a) a motor (b) a water pump (c) a motion sensor (d) an LED
  24. 24.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a servo motor (d) a motion sensor
  25. 25.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a keypad (d) a light sensor
  26. 26.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  29. 29.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a small display
  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 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.True or false: “the room temperature” is a digital signal. (a) True (b) False
  32. 32.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  33. 33.🔍 Which is the odd one out? (a) a temperature sensor (b) a servo motor (c) a small display (d) a buzzer
  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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  36. 36.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  37. 37.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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