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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 226 · 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.Which of these is an output? (a) a turning knob (b) a small display (c) a motion sensor (d) a push button
  5. 5.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) an LED
  7. 7.Which of these is an input? (a) a small display (b) a motor (c) an LED (d) a keypad
  8. 8.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a servo motor (d) a buzzer
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a keypad (d) a push button
  10. 10.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  13. 13.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  15. 15.Which of these is an input? (a) a turning knob (b) an LED (c) a servo motor (d) a water pump
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  17. 17.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a motor (d) a push button
  18. 18.💡 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
  19. 19.Which of these is an output? (a) a sound sensor (b) a push button (c) a light sensor (d) a motor
  20. 20.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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
  22. 22.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  23. 23.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  24. 24.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  25. 25.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  28. 28.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  31. 31.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a buzzer (d) a turning knob
  33. 33.Which of these is an input? (a) a motor (b) a buzzer (c) a push button (d) a servo motor
  34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  35. 35.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  36. 36.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a sound sensor (d) a servo motor
  37. 37.Which of these is an input? (a) a motor (b) a small display (c) a sound sensor (d) a water pump
  38. 38.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a speaker (d) a push button
  40. 40.Which of these is an output? (a) a water pump (b) a temperature sensor (c) a push button (d) a sound sensor

Answer key

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

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