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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 128 · 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.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  2. 2.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a motor (d) a sound sensor
  3. 3.💡 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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a speaker (d) a keypad
  5. 5.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  7. 7.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a light sensor (d) a buzzer
  8. 8.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an input? (a) an LED (b) a keypad (c) a buzzer (d) a servo motor
  10. 10.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  14. 14.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  15. 15.True or false: “many values in a range” is an analog signal. (a) False (b) True
  16. 16.Which of these is an input? (a) a water pump (b) a small display (c) a speaker (d) a turning knob
  17. 17.💡 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
  18. 18.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  19. 19.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  21. 21.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  22. 22.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  23. 23.📶 Digital or analog: the room temperature? (a) digital (b) analog
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an input? (a) a motor (b) a speaker (c) a motion sensor (d) an LED
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.📶 Digital or analog: many values in a range? (a) digital (b) analog
  28. 28.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  30. 30.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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
  32. 32.💡 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 8 LOW
    set pin 8 LOW
    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 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  36. 36.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  37. 37.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  39. 39.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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