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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 541 · 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) a water pump (b) a buzzer (c) a servo motor (d) a motion sensor
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  3. 3.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  6. 6.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  7. 7.Which of these is an output? (a) a keypad (b) a turning knob (c) a water pump (d) a sound sensor
  8. 8.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a temperature sensor (c) a light sensor (d) a turning knob
  10. 10.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  11. 11.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  13. 13.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  16. 16.📶 Digital or analog: the room temperature? (a) analog (b) digital
  17. 17.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a push button (d) an LED
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  20. 20.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  21. 21.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a water pump (b) a motor (c) an LED (d) a motion sensor
  23. 23.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a temperature sensor (d) a light sensor
  24. 24.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) an LED (d) a sound sensor
  29. 29.Which of these is an output? (a) a servo motor (b) a motion sensor (c) a push button (d) a temperature sensor
  30. 30.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) an LED
  31. 31.Which of these is an output? (a) a motor (b) a motion sensor (c) a keypad (d) a light sensor
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a water pump (d) a light sensor
  33. 33.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a motion sensor (d) a push button
  34. 34.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) a motor (d) a buzzer
  38. 38.Which of these is an input? (a) a speaker (b) an LED (c) a water pump (d) a temperature sensor
  39. 39.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  40. 40.💡 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

Answer key

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

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