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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 911 · 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: “how bright a room is” is an analog signal. (a) True (b) False
  2. 2.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  3. 3.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a turning knob (d) a servo motor
  4. 4.Which of these is an input? (a) an LED (b) a servo motor (c) a temperature sensor (d) a motor
  5. 5.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  6. 6.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a motor (d) a temperature sensor
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  11. 11.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  12. 12.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a motion sensor (d) a push button
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    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
  19. 19.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  20. 20.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.Which of these is an input? (a) a small display (b) an LED (c) a speaker (d) a light sensor
  23. 23.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  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 HIGH
    set pin 7 HIGH
    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 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.💡 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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) a turning knob (b) an LED (c) a small display (d) a servo motor
  31. 31.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.Which of these is an input? (a) a keypad (b) a buzzer (c) a motor (d) an LED
  33. 33.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  34. 34.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a temperature sensor (d) a motion sensor
  36. 36.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  37. 37.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.Which of these is an output? (a) a servo motor (b) a keypad (c) a push button (d) a sound sensor
  39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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