Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 185 · 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.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
2. 2.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 7 HIGH
   set pin 7 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
3. 3.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
4. 4.💡 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 8 HIGH
   set pin 7 HIGH
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
5. 5.True or false: “the room temperature” is a digital signal. (a) False (b) True
6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
7. 7.Which of these is an input? (a) a motor (b) a small display (c) a motion sensor (d) a water pump
8. 8.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
10. 10.📶 Digital or analog: a button: pressed or not? (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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
13. 13.True or false: “many values in a range” is an analog signal. (a) False (b) True
14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
17. 17.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
18. 18.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
19. 19.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
20. 20.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
22. 22.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.💡 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 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
25. 25.True or false: “many values in a range” is a digital signal. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a light sensor (d) a water pump
27. 27.Which of these is an output? (a) a keypad (b) a light sensor (c) a turning knob (d) a motor
28. 28.💡 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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
29. 29.💡 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) ON (b) OFF
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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.🔌 Is a sound sensor 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
33. 33.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a turning knob (d) an LED
34. 34.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
35. 35.💡 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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
36. 36.True or false: “how bright a room is” is an analog signal. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a push button (d) a speaker
38. 38.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a buzzer (d) a keypad
39. 39.Which of these is an output? (a) a turning knob (b) a light sensor (c) a push button (d) a servo motor
40. 40.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids