Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 537 · 40 questions

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.

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

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