Intruder Alarm System

Which component is used to alert when motion is detected?

• PIR sensor

• Green LED

• Red LED

• Buzzer

Which condition turns off the buzzer?

• pirState == HIGH

• val == LOW

• val == HIGH

• Serial.println()

34. How can you make the alarm silent while still detecting motion?

• Disconnect the PIR sensor

• Use digitalWrite(BUZZER_PIN, LOW)

• Change the state of pirState

95. Which component must be connected to the 5V pin for proper operation?

• PIR sensor

• Buzzer

• Red LED

• Green LED

What does the variable pirState track in the code?

• The status of the LEDs
  

• Whether the buzzer is on or off
  

• Whether motion is currently detected or not
  

• The pin number of the PIR sensor

Which function initializes the pin modes for the components?

• void loop()
  

• pinMode()
  

• digitalWrite()
  

• void setup()

When the PIR sensor detects motion, what is the state of the pirState variable set to?

• HIGH
  

• LOW
  

• 1
  

• 0