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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 876 · 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.Which of these is an input? (a) an LED (b) a water pump (c) a sound sensor (d) a speaker
  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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a servo motor (d) a small display
  5. 5.💡 An LED (with its resistor) is on pin 8. 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
  6. 6.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  8. 8.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  9. 9.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  10. 10.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a servo motor (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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a speaker (d) a light sensor
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an input? (a) a motor (b) a speaker (c) a motion sensor (d) an LED
  15. 15.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) an LED (d) a light sensor
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a small display (d) a temperature sensor
  18. 18.💡 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
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  20. 20.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  21. 21.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  22. 22.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a buzzer (d) a turning knob
  24. 24.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.Which of these is an input? (a) a keypad (b) a small display (c) a speaker (d) a buzzer
  26. 26.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  29. 29.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  31. 31.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  32. 32.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  33. 33.True or false: “many values in a range” is an analog signal. (a) True (b) False
  34. 34.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  35. 35.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  36. 36.Which of these is an output? (a) a push button (b) a temperature sensor (c) a turning knob (d) a small display
  37. 37.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  38. 38.📶 Digital or analog: the room temperature? (a) digital (b) analog
  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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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