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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 370 · 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.Which of these is an output? (a) a small display (b) a turning knob (c) a keypad (d) a push button
  2. 2.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.Which of these is an output? (a) a turning knob (b) a light sensor (c) a water pump (d) a motion sensor
  5. 5.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) an LED (d) a turning knob
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  8. 8.Which of these is an input? (a) an LED (b) a push button (c) a water pump (d) a servo motor
  9. 9.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a sound sensor (d) a push button
  10. 10.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) an LED (d) a motor
  11. 11.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  12. 12.Which of these is an input? (a) a water pump (b) a motor (c) a light sensor (d) a servo motor
  13. 13.📶 Digital or analog: many values in a range? (a) digital (b) analog
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  17. 17.Which of these is an output? (a) a turning knob (b) a keypad (c) a light sensor (d) an LED
  18. 18.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  19. 19.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  23. 23.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a temperature sensor (d) a sound sensor
  24. 24.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  30. 30.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a keypad (d) a speaker
  31. 31.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  36. 36.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.Which of these is an input? (a) a servo motor (b) an LED (c) a temperature sensor (d) a motor
  39. 39.Which of these is an output? (a) a push button (b) a motion sensor (c) a keypad (d) a buzzer
  40. 40.📶 Digital or analog: a knob turned part way? (a) digital (b) analog

Answer key

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

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