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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 114 · 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  3. 3.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a water pump (d) a temperature sensor
  4. 4.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  5. 5.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  6. 6.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a speaker (d) a keypad
  7. 7.True or false: “many values in a range” is a digital signal. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a light sensor (d) a push button
  9. 9.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a turning knob (d) a small display
  10. 10.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  11. 11.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  16. 16.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    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
  21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  23. 23.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a water pump (d) a servo motor
  24. 24.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a motion sensor (d) a speaker
  25. 25.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  30. 30.💡 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
  31. 31.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  32. 32.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  35. 35.Which of these is an output? (a) a push button (b) a keypad (c) a sound sensor (d) a small display
  36. 36.Which of these is an input? (a) a servo motor (b) an LED (c) a turning knob (d) a small display
  37. 37.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  38. 38.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  40. 40.💡 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

Answer key

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

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