Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 410 · 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: a button: pressed or not? (a) analog (b) digital
2. 2.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
3. 3.💡 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
   set pin 7 HIGH
   set pin 8 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
4. 4.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
5. 5.💡 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 8 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
6. 6.💡 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
7. 7.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
8. 8.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
9. 9.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
10. 10.True or false: “how bright a room is” is a digital signal. (a) False (b) True
11. 11.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) an LED (d) a small display
13. 13.Which of these is an input? (a) a water pump (b) a servo motor (c) a push button (d) a buzzer
14. 14.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a keypad (d) a motor
15. 15.💡 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
    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 HIGH
    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) ON (b) OFF
17. 17.💡 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
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
18. 18.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
19. 19.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a keypad (d) a water pump
20. 20.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a sound sensor (d) a small display
21. 21.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
22. 22.💡 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) OFF (b) ON
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 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
24. 24.💡 An LED (with its resistor) is on pin 8. 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 HIGH
    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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
26. 26.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
27. 27.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
29. 29.True or false: “many values in a range” is a digital signal. (a) False (b) True
30. 30.Which of these is an output? (a) a turning knob (b) a push button (c) a servo motor (d) a sound sensor
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 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
33. 33.Which of these is an output? (a) an LED (b) a turning knob (c) a motion sensor (d) a temperature sensor
34. 34.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a speaker (d) a small display
35. 35.🔍 Which is the odd one out? (a) a push button (b) a small display (c) a sound sensor (d) a motion sensor
36. 36.Which of these is an output? (a) a push button (b) a motion sensor (c) a light sensor (d) a water pump
37. 37.📶 Digital or analog: many values in a range? (a) digital (b) analog
38. 38.Which of these is an input? (a) a turning knob (b) a buzzer (c) a servo motor (d) an LED
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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
40. 40.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON

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