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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 972 · 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 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    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
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) an LED (d) a motor
  5. 5.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  6. 6.Which of these is an output? (a) a motor (b) a keypad (c) a push button (d) a turning knob
  7. 7.Which of these is an input? (a) an LED (b) a buzzer (c) a motor (d) a light sensor
  8. 8.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  9. 9.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  10. 10.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  11. 11.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  12. 12.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔍 Which is the odd one out? (a) a speaker (b) a keypad (c) a sound sensor (d) a motion sensor
  16. 16.True or false: “many values in a range” is a digital signal. (a) False (b) True
  17. 17.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  18. 18.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 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) ON (b) OFF
  21. 21.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 5 V (d) 1.5 V
  22. 22.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) a sound sensor (d) a push button
  24. 24.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  25. 25.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a small display (d) a light sensor
  29. 29.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  31. 31.📶 Digital or analog: the room temperature? (a) digital (b) analog
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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) OFF (b) ON
  34. 34.Which of these is an input? (a) a small display (b) a water pump (c) a motor (d) a push button
  35. 35.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  36. 36.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.Which of these is an input? (a) a keypad (b) a speaker (c) a buzzer (d) a servo motor
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog

Answer key

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

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