Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 641 · 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.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
2. 2.True or false: “many values in a range” is a digital signal. (a) True (b) False
3. 3.📶 Digital or analog: the room temperature? (a) digital (b) analog
4. 4.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
5. 5.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a keypad (d) a motion sensor
6. 6.💡 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 HIGH
   set pin 8 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
7. 7.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
8. 8.Which of these is an input? (a) a turning knob (b) a water pump (c) a servo motor (d) an LED
9. 9.💡 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 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
10. 10.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a servo motor (d) a temperature sensor
11. 11.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a light sensor (d) a small display
12. 12.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
13. 13.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
14. 14.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a buzzer (d) a water pump
16. 16.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
17. 17.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a buzzer (d) a sound sensor
18. 18.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a servo motor (d) an LED
19. 19.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a buzzer (d) a small display
20. 20.💡 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 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.💡 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 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
22. 22.Which of these is an input? (a) a water pump (b) a motor (c) an LED (d) a temperature sensor
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 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
24. 24.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
25. 25.🔍 Which is the odd one out? (a) a motor (b) a motion sensor (c) an LED (d) a buzzer
26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) a water pump (d) a buzzer
27. 27.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a light sensor (d) an LED
28. 28.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a speaker (d) a keypad
29. 29.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
30. 30.💡 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) OFF (b) ON
31. 31.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a servo motor (c) an LED (d) a water pump
34. 34.Which of these is an output? (a) a keypad (b) a light sensor (c) an LED (d) a temperature sensor
35. 35.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
36. 36.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
37. 37.💡 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
38. 38.💡 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 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
40. 40.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a turning knob (d) a push button

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