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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 777 · 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.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  2. 2.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an output? (a) a servo motor (b) a keypad (c) a turning knob (d) a temperature sensor
  4. 4.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 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
  10. 10.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  11. 11.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  13. 13.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  16. 16.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a motion sensor (d) a servo motor
  18. 18.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a small display (d) a keypad
  19. 19.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) an LED (d) a motor
  20. 20.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    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
  24. 24.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a buzzer (d) a keypad
  26. 26.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a push button (d) a water pump
  27. 27.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) a resistor (d) an 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.Which of these is an input? (a) a motion sensor (b) a water pump (c) a small display (d) a servo motor
  30. 30.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  33. 33.📶 Digital or analog: the room temperature? (a) analog (b) digital
  34. 34.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a turning knob (d) a temperature sensor
  37. 37.💡 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
  38. 38.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a motor (d) a servo motor
  39. 39.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a push button (d) an LED
  40. 40.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a speaker (d) a motion sensor

Answer key

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

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