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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 705 · 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) input (b) output
  2. 2.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a small display (d) a light sensor
  3. 3.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  4. 4.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  8. 8.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.Which of these is an input? (a) a water pump (b) a sound sensor (c) a buzzer (d) an LED
  10. 10.Which of these is an output? (a) an LED (b) a temperature sensor (c) a motion sensor (d) a sound sensor
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  14. 14.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  15. 15.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.Which of these is an output? (a) a push button (b) a water pump (c) a keypad (d) a turning knob
  17. 17.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  19. 19.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  20. 20.True or false: “the room temperature” is an analog signal. (a) False (b) True
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  23. 23.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  24. 24.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  25. 25.💡 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
    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
  26. 26.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  29. 29.Which of these is an output? (a) a keypad (b) a motor (c) a turning knob (d) a light sensor
  30. 30.🔍 Which is the odd one out? (a) a speaker (b) a temperature sensor (c) a turning knob (d) a sound sensor
  31. 31.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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
    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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a motion sensor (d) a servo motor
  37. 37.Which of these is an input? (a) an LED (b) a turning knob (c) a water pump (d) a servo motor
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.Which of these is an input? (a) a temperature sensor (b) a servo motor (c) a buzzer (d) a small display
  40. 40.📶 Digital or analog: many values in a range? (a) analog (b) digital

Answer key

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

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