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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 530 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  2. 2.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a water pump (d) a push button
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  6. 6.Which of these is an output? (a) a servo motor (b) a keypad (c) a light sensor (d) a motion sensor
  7. 7.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.Which of these is an output? (a) a keypad (b) a motion sensor (c) a sound sensor (d) a water pump
  9. 9.💡 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) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a buzzer (d) a push button
  11. 11.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  12. 12.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a turning knob (d) a push button
  13. 13.💡 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 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motor (d) a buzzer
  15. 15.Which of these is an input? (a) a keypad (b) a buzzer (c) a small display (d) an LED
  16. 16.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  19. 19.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  20. 20.True or false: “the room temperature” is a digital signal. (a) False (b) True
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a motor (d) a turning knob
  24. 24.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  25. 25.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  26. 26.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  29. 29.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.📶 Digital or analog: the room temperature? (a) analog (b) digital
  31. 31.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a servo motor (d) a light sensor
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.Which of these is an output? (a) an LED (b) a light sensor (c) a push button (d) a keypad
  37. 37.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  38. 38.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  39. 39.💡 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) ON (b) OFF
  40. 40.Which of these is an output? (a) a keypad (b) a push button (c) a light sensor (d) a buzzer

Answer key

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

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