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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 808 · 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 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
  4. 4.True or false: “many values in a range” is a digital signal. (a) True (b) False
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  7. 7.Which of these is an output? (a) an LED (b) a motion sensor (c) a temperature sensor (d) a keypad
  8. 8.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  9. 9.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a speaker (d) a turning knob
  10. 10.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 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) OFF (b) ON
  12. 12.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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 7 HIGH
    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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  16. 16.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔍 Which is the odd one out? (a) a sound sensor (b) a motion sensor (c) a servo motor (d) a keypad
  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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  21. 21.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  22. 22.Which of these is an output? (a) a servo motor (b) a temperature sensor (c) a motion sensor (d) a keypad
  23. 23.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  24. 24.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  25. 25.Which of these is an input? (a) a motor (b) a turning knob (c) a small display (d) a water pump
  26. 26.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  27. 27.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a temperature sensor (d) an LED
  28. 28.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  29. 29.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an output? (a) a small display (b) a light sensor (c) a sound sensor (d) a temperature sensor
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a keypad (d) a push button
  33. 33.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  34. 34.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a speaker (d) a servo motor
  35. 35.Which of these is an input? (a) a speaker (b) a motor (c) a small display (d) a keypad
  36. 36.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  37. 37.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a push button (d) a small display
  38. 38.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  39. 39.💡 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
  40. 40.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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