Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 490 · 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 7. All pins start LOW. The program runs once:
   set pin 8 HIGH
   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
2. 2.💡 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
   Is the LED ON or OFF at the end? (a) OFF (b) ON
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 8 HIGH
   set pin 7 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
4. 4.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a motor (d) a sound sensor
6. 6.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motion sensor (d) a keypad
7. 7.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
8. 8.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
9. 9.💡 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
   Is the LED ON or OFF at the end? (a) OFF (b) ON
10. 10.True or false: “how bright a room is” is an analog signal. (a) False (b) True
11. 11.Which of these is an input? (a) a motor (b) a buzzer (c) a motion sensor (d) a water pump
12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
13. 13.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
14. 14.💡 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
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a turning knob (d) a water pump
16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
17. 17.💡 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) OFF (b) ON
18. 18.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a turning knob (d) a sound sensor
19. 19.Which of these is an input? (a) a water pump (b) a light sensor (c) a buzzer (d) an LED
20. 20.💡 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
21. 21.💡 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
    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
22. 22.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output
23. 23.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
24. 24.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a servo motor (d) a speaker
27. 27.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a push button (d) a temperature sensor
28. 28.True or false: “many values in a range” is a digital signal. (a) True (b) False
29. 29.True or false: “the room temperature” is a digital signal. (a) False (b) True
30. 30.💡 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.📶 Digital or analog: the room temperature? (a) analog (b) digital
32. 32.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
33. 33.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
34. 34.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    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 8 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 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.📶 Digital or analog: many values in a range? (a) digital (b) analog
40. 40.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output

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