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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 908 · 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.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  2. 2.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
  3. 3.💡 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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.Which of these is an input? (a) an LED (b) a small display (c) a sound sensor (d) a motor
  5. 5.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  6. 6.Which of these is an output? (a) a water pump (b) a sound sensor (c) a turning knob (d) a light sensor
  7. 7.Which of these is an input? (a) a speaker (b) a buzzer (c) a servo motor (d) a light sensor
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    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
  10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  12. 12.💡 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
    set pin 7 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 an analog signal. (a) True (b) False
  14. 14.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  16. 16.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  17. 17.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  18. 18.True or false: “the room temperature” is a digital signal. (a) True (b) False
  19. 19.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) an LED (d) a keypad
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a temperature sensor (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 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  28. 28.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  29. 29.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  31. 31.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  33. 33.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  35. 35.💡 An LED (with its resistor) is on pin 7. 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 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 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a light sensor (d) a keypad
  40. 40.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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