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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 279 · 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 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.True or false: “many values in a range” is a digital signal. (a) False (b) True
  3. 3.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  6. 6.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  8. 8.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  9. 9.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a speaker (d) a turning knob
  10. 10.Which of these is an input? (a) a sound sensor (b) a motor (c) an LED (d) a water pump
  11. 11.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.💡 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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  15. 15.Which of these is an output? (a) an LED (b) a push button (c) a motion sensor (d) a light sensor
  16. 16.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a servo motor (d) a small display
  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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    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 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.True or false: “many values in a range” is an analog signal. (a) False (b) True
  21. 21.True or false: “the room temperature” is a digital signal. (a) True (b) False
  22. 22.Which of these is an input? (a) a water pump (b) a light sensor (c) a servo motor (d) an LED
  23. 23.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  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 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  26. 26.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an input? (a) a servo motor (b) a water pump (c) a buzzer (d) a temperature sensor
  29. 29.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  31. 31.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) an LED (d) a light sensor
  32. 32.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a push button (d) a water pump
  33. 33.True or false: “the room temperature” is an analog signal. (a) False (b) True
  34. 34.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an output? (a) a turning knob (b) a small display (c) a motion sensor (d) a temperature sensor
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  39. 39.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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