Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 105 · 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) ten (d) a thousand
2. 2.Which of these is an input? (a) an LED (b) a speaker (c) a keypad (d) a water pump
3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a speaker (d) a keypad
4. 4.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
5. 5.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
6. 6.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
7. 7.💡 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
   Is the LED ON or OFF at the end? (a) ON (b) OFF
8. 8.💡 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
   Is the LED ON or OFF at the end? (a) OFF (b) ON
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
   set pin 7 LOW
   set pin 8 HIGH
   set pin 8 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
10. 10.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a small display (d) a keypad
11. 11.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
13. 13.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a light sensor (d) an LED
14. 14.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
17. 17.💡 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) OFF (b) ON
18. 18.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a turning knob (d) a push button
19. 19.💡 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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
20. 20.💡 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 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
21. 21.Which of these is an input? (a) a motor (b) a buzzer (c) an LED (d) a turning knob
22. 22.Which of these is an input? (a) a motion sensor (b) a buzzer (c) a motor (d) a small display
23. 23.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
24. 24.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
26. 26.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
27. 27.💡 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
28. 28.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a temperature sensor (d) a buzzer
29. 29.Which of these is an input? (a) a small display (b) a motor (c) a sound sensor (d) an LED
30. 30.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
32. 32.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a small display (d) a water pump
33. 33.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
34. 34.📶 Digital or analog: the room temperature? (a) digital (b) analog
35. 35.True or false: “many values in a range” is a digital signal. (a) True (b) False
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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
37. 37.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) an LED (d) a turning knob
38. 38.💡 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
    set pin 7 HIGH
    set pin 7 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
40. 40.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a turning knob (d) a servo motor

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