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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 196 · 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.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  3. 3.💡 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
    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 speaker (b) a servo motor (c) an LED (d) a push button
  5. 5.Which of these is an output? (a) a small display (b) a light sensor (c) a temperature sensor (d) a sound sensor
  6. 6.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  7. 7.📶 Digital or analog: the room temperature? (a) analog (b) digital
  8. 8.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  11. 11.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  12. 12.💡 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
  13. 13.Which of these is an input? (a) an LED (b) a push button (c) a servo motor (d) a water pump
  14. 14.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) a water pump (d) an LED
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  18. 18.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  19. 19.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a small display (d) a sound sensor
  20. 20.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) a turning knob (d) a servo motor
  21. 21.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  22. 22.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  23. 23.💡 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
  24. 24.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.📶 Digital or analog: many values in a range? (a) digital (b) analog
  26. 26.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  27. 27.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  28. 28.💡 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
  29. 29.💡 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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “how loud a sound is” is an analog 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 LOW
    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
  32. 32.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  33. 33.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  34. 34.Which of these is an input? (a) a servo motor (b) a small display (c) an LED (d) a sound sensor
  35. 35.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a keypad (d) a temperature sensor
  37. 37.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  38. 38.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  39. 39.💡 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 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) a battery (d) an output

Answer key

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

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