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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 589 · 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.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  2. 2.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a push button (d) a temperature sensor
  5. 5.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.Which of these is an input? (a) a temperature sensor (b) an LED (c) a small display (d) a servo motor
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a keypad (d) a push button
  9. 9.Which of these is an output? (a) a small display (b) a turning knob (c) a temperature sensor (d) a motion sensor
  10. 10.Which of these is an input? (a) a motor (b) a push button (c) an LED (d) a servo motor
  11. 11.🔍 Which is the odd one out? (a) a light sensor (b) a motor (c) a push button (d) a sound sensor
  12. 12.True or false: “many values in a range” is an analog signal. (a) True (b) False
  13. 13.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  16. 16.Which of these is an output? (a) a light sensor (b) a motion sensor (c) an LED (d) a push button
  17. 17.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  18. 18.💡 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
  19. 19.Which of these is an input? (a) an LED (b) a motor (c) a speaker (d) a turning knob
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  22. 22.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a buzzer (d) a motor
  23. 23.💡 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 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 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  26. 26.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  27. 27.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  29. 29.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) an LED (d) a temperature sensor
  30. 30.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  33. 33.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a push button (d) a servo motor
  36. 36.Which of these is an input? (a) a speaker (b) a buzzer (c) a keypad (d) an LED
  37. 37.💡 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 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.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a push button (d) a water pump

Answer key

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

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