Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 130 · 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.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
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 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 input? (a) a temperature sensor (b) a buzzer (c) a motor (d) an LED
4. 4.Which of these is an output? (a) a motion sensor (b) a push button (c) an LED (d) a light sensor
5. 5.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
7. 7.True or false: “the room temperature” is an analog signal. (a) True (b) False
8. 8.💡 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
   Is the LED ON or OFF at the end? (a) OFF (b) ON
9. 9.💡 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
   Is the LED ON or OFF at the end? (a) ON (b) OFF
10. 10.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
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
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
13. 13.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
14. 14.True or false: “many values in a range” is a digital signal. (a) True (b) False
15. 15.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
17. 17.Which of these is an input? (a) a motor (b) a servo motor (c) an LED (d) a light sensor
18. 18.Which of these is an input? (a) an LED (b) a sound sensor (c) a servo motor (d) a speaker
19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
20. 20.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
22. 22.Which of these is an output? (a) a turning knob (b) a servo motor (c) a temperature sensor (d) a motion sensor
23. 23.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a buzzer (d) a push button
24. 24.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
25. 25.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
26. 26.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
27. 27.True or false: “many values in a range” is an analog signal. (a) False (b) True
28. 28.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
30. 30.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
31. 31.🔍 Which is the odd one out? (a) a sound sensor (b) a motion sensor (c) a turning knob (d) a small display
32. 32.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
33. 33.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
34. 34.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
35. 35.True or false: “how bright a room is” is a digital signal. (a) True (b) False
36. 36.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
37. 37.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
38. 38.💡 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 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
39. 39.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
40. 40.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF

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