Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 415 · 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: “a button: pressed or not” is an analog signal. (a) False (b) True
2. 2.Which of these is an input? (a) a turning knob (b) a water pump (c) a buzzer (d) an LED
3. 3.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
4. 4.Which of these is an output? (a) a push button (b) a temperature sensor (c) a turning knob (d) a speaker
5. 5.💡 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 HIGH
   set pin 7 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
6. 6.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) an LED (d) a water pump
7. 7.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
8. 8.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
9. 9.Which of these is an input? (a) a speaker (b) a water pump (c) a motion sensor (d) a buzzer
10. 10.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
11. 11.📶 Digital or analog: many values in a range? (a) digital (b) analog
12. 12.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a speaker (d) a buzzer
13. 13.💡 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
14. 14.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
15. 15.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
16. 16.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
17. 17.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a light sensor (d) a turning knob
18. 18.Which of these is an output? (a) a turning knob (b) a keypad (c) a water pump (d) a temperature sensor
19. 19.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
20. 20.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
21. 21.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 0 V (d) 50 V
23. 23.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
24. 24.💡 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 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
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 7 LOW
    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
26. 26.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
29. 29.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
30. 30.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.💡 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
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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
34. 34.📶 Digital or analog: how bright a room is? (a) analog (b) digital
35. 35.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
36. 36.💡 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) ON (b) OFF
37. 37.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
38. 38.💡 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 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
40. 40.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V

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