Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 395 · 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) one (b) two (c) a thousand (d) ten
2. 2.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
3. 3.💡 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 8 HIGH
   set pin 8 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
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 7 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
5. 5.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) an LED (d) a keypad
6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
8. 8.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a push button (d) a servo motor
9. 9.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
11. 11.📶 Digital or analog: the room temperature? (a) analog (b) digital
12. 12.💡 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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
13. 13.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
14. 14.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a sound sensor (d) a servo motor
16. 16.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
17. 17.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
18. 18.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
19. 19.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
20. 20.💡 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 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a turning knob (d) a servo motor
22. 22.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.💡 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 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a push button (d) a keypad
26. 26.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
27. 27.Which of these is an output? (a) a keypad (b) a buzzer (c) a sound sensor (d) a temperature sensor
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 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
29. 29.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
30. 30.💡 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 8 HIGH
    set pin 8 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 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
32. 32.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a turning knob (d) a speaker
33. 33.📶 Digital or analog: many values in a range? (a) digital (b) analog
34. 34.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
35. 35.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
36. 36.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
37. 37.💡 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 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
38. 38.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
39. 39.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
40. 40.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input

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