Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 10 · 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.💡 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 7 HIGH
   set pin 7 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
3. 3.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
4. 4.💡 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 7 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
5. 5.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
6. 6.📶 Digital or analog: the room temperature? (a) analog (b) digital
7. 7.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
8. 8.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
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 8 HIGH
   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
10. 10.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a small display (d) a water pump
11. 11.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.Which of these is an input? (a) a water pump (b) a keypad (c) an LED (d) a motor
13. 13.💡 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 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
14. 14.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
15. 15.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
16. 16.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
18. 18.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
20. 20.💡 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 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 light sensor (b) a buzzer (c) a motion sensor (d) a keypad
22. 22.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
23. 23.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
24. 24.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
25. 25.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) an LED (d) a buzzer
26. 26.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
27. 27.💡 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 HIGH
    set pin 7 HIGH
    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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
29. 29.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a small display (d) a keypad
30. 30.True or false: “how bright a room is” is a digital signal. (a) False (b) True
31. 31.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
32. 32.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
33. 33.Which of these is an input? (a) a motor (b) an LED (c) a speaker (d) a motion sensor
34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
35. 35.📶 Digital or analog: a button: pressed or not? (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 7 LOW
    set pin 7 LOW
    set pin 8 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 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
38. 38.💡 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 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
40. 40.📶 Digital or analog: many values in a range? (a) analog (b) digital

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