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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 166 · 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 output? (a) a sound sensor (b) a motion sensor (c) a motor (d) a push button
  2. 2.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  3. 3.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔍 Which is the odd one out? (a) a keypad (b) a water pump (c) a push button (d) a turning knob
  5. 5.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  6. 6.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  7. 7.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  8. 8.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a keypad (d) a light sensor
  9. 9.💡 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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  12. 12.📶 Digital or analog: the room temperature? (a) analog (b) digital
  13. 13.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an output? (a) a keypad (b) a motion sensor (c) a push button (d) a small display
  15. 15.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  16. 16.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  17. 17.💡 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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) a light sensor (d) a buzzer
  20. 20.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a servo motor (d) a motor
  21. 21.Which of these is an input? (a) a motor (b) a water pump (c) a push button (d) a servo motor
  22. 22.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  23. 23.💡 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
  24. 24.Which of these is an output? (a) a light sensor (b) a push button (c) a turning knob (d) an LED
  25. 25.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  27. 27.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  29. 29.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  31. 31.💡 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) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a motion sensor (d) an LED
  33. 33.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) an LED (d) a motor
  34. 34.Which of these is an output? (a) a servo motor (b) a light sensor (c) a turning knob (d) a push button
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V
  37. 37.Which of these is an output? (a) a motion sensor (b) a buzzer (c) a light sensor (d) a turning knob
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a servo motor (d) a motor
  39. 39.💡 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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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