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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 203 · 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.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  2. 2.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  3. 3.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.Which of these is an input? (a) a small display (b) a temperature sensor (c) a water pump (d) a speaker
  6. 6.Which of these is an input? (a) a motor (b) an LED (c) a sound sensor (d) a buzzer
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  8. 8.True or false: “many values in a range” is a digital signal. (a) True (b) False
  9. 9.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  10. 10.📶 Digital or analog: the room temperature? (a) analog (b) digital
  11. 11.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  12. 12.💡 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
  13. 13.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a small display (d) a keypad
  14. 14.Which of these is an output? (a) a push button (b) a servo motor (c) a light sensor (d) a motion sensor
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  21. 21.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  23. 23.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  24. 24.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a motion sensor (d) a light sensor
  25. 25.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a servo motor (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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔍 Which is the odd one out? (a) an LED (b) a water pump (c) a light sensor (d) a speaker
  28. 28.Which of these is an input? (a) a water pump (b) an LED (c) a small display (d) a keypad
  29. 29.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a motion sensor (d) a light sensor
  30. 30.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a buzzer (d) an LED
  31. 31.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  32. 32.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a sound sensor (d) a turning knob
  34. 34.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  37. 37.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a sound sensor (d) a light sensor
  39. 39.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery

Answer key

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

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