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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 654 · 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 temperature sensor (b) an LED (c) a light sensor (d) a motion sensor
  2. 2.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  7. 7.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  9. 9.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  10. 10.Which of these is an input? (a) an LED (b) a servo motor (c) a push button (d) a buzzer
  11. 11.Which of these is an input? (a) a water pump (b) a keypad (c) a motor (d) an LED
  12. 12.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  13. 13.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  14. 14.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  15. 15.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) a speaker (d) a turning knob
  21. 21.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a temperature sensor (d) a turning knob
  22. 22.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.💡 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
  24. 24.🔍 Which is the odd one out? (a) a light sensor (b) a speaker (c) a servo motor (d) a small display
  25. 25.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a temperature sensor (d) a water pump
  26. 26.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  27. 27.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a servo motor (d) a temperature sensor
  31. 31.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 Digital or analog: the room temperature? (a) digital (b) analog
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    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 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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