Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 335 · 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.💡 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
   Is the LED ON or OFF at the end? (a) ON (b) OFF
2. 2.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
4. 4.📶 Digital or analog: how bright a room is? (a) analog (b) digital
5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a turning knob (d) a speaker
6. 6.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
7. 7.💡 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
   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
8. 8.True or false: “how bright a room is” is a digital signal. (a) False (b) True
9. 9.Which of these is an input? (a) a small display (b) a water pump (c) an LED (d) a push button
10. 10.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.Which of these is an output? (a) a sound sensor (b) a small display (c) a turning knob (d) a keypad
13. 13.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
14. 14.Which of these is an output? (a) a servo motor (b) a sound sensor (c) a temperature sensor (d) a turning knob
15. 15.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
16. 16.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
17. 17.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
18. 18.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a small display (d) a buzzer
19. 19.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
20. 20.Which of these is an output? (a) a light sensor (b) a keypad (c) an LED (d) a push button
21. 21.💡 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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
22. 22.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a light sensor (d) a buzzer
23. 23.💡 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 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
25. 25.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
26. 26.📶 Digital or analog: many values in a range? (a) digital (b) analog
27. 27.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
28. 28.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a temperature sensor (d) a servo motor
29. 29.Which of these is an output? (a) a sound sensor (b) a water pump (c) a turning knob (d) a motion sensor
30. 30.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
33. 33.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
35. 35.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
36. 36.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a temperature sensor (d) a servo motor
37. 37.💡 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
    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 7 HIGH
    set pin 7 LOW
    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 7. 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) OFF (b) ON
40. 40.Which of these is an output? (a) a speaker (b) a light sensor (c) a motion sensor (d) a push button

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