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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 506 · 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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.Which of these is an output? (a) a light sensor (b) a buzzer (c) a push button (d) a temperature sensor
  5. 5.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  8. 8.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  10. 10.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a push button (d) a small display
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a light sensor (d) a keypad
  12. 12.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a water pump (d) a motion sensor
  14. 14.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  15. 15.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a servo motor (d) a light sensor
  16. 16.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a sound sensor (d) an LED
  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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  20. 20.💡 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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a sound sensor (b) a small display (c) a water pump (d) a buzzer
  22. 22.💡 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) ON (b) OFF
  23. 23.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  24. 24.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  25. 25.📶 Digital or analog: many values in a range? (a) analog (b) digital
  26. 26.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  29. 29.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a sound sensor (d) a small display
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 Digital or analog: the room temperature? (a) digital (b) analog
  33. 33.True or false: “the room temperature” is a digital signal. (a) False (b) True
  34. 34.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  37. 37.💡 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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  39. 39.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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