Alarm system with sensor and buzzer in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the role of a sensor in an alarm system?

The sensor detects changes in the environment, like motion or opening a door, and sends a signal to trigger the alarm.

beginner

How does a buzzer work in an alarm system?

A buzzer produces a loud sound when it receives an electrical signal, alerting people to a possible problem.

beginner

In Arduino code, which function is used to read the sensor input?

The function digitalRead(pin) is used to read the sensor's digital signal from the specified pin.

beginner

Why do we use pinMode(pin, INPUT) for the sensor pin in Arduino?

We set the sensor pin as INPUT so Arduino knows it should listen for signals coming from the sensor.

beginner

What is the purpose of pinMode(pin, OUTPUT) for the buzzer pin?

Setting the buzzer pin as OUTPUT allows Arduino to send signals to turn the buzzer on or off.

Which Arduino function turns the buzzer ON?

A digitalWrite(buzzerPin, HIGH)

B digitalRead(buzzerPin)

C pinMode(buzzerPin, INPUT)

D analogRead(buzzerPin)

To turn the buzzer ON, we send a HIGH signal using digitalWrite.

What does the sensor output when it detects motion?

A No signal

B LOW signal

C HIGH signal

D Analog voltage

Most motion sensors output a HIGH signal when motion is detected.

Which pin mode should be set for a sensor input?

A INPUT

B INPUT_PULLUP

C OUTPUT

D ANALOG

Sensors are inputs, so the pin mode should be INPUT.

What happens if you set the buzzer pin as INPUT instead of OUTPUT?

A Buzzer will sound continuously

B Buzzer will not sound

C Arduino will crash

D Sensor will trigger buzzer

If the buzzer pin is INPUT, Arduino cannot send signals to turn it on.

Which Arduino function reads a digital sensor value?

A digitalWrite()

B pinMode()

C analogRead()

D digitalRead()

digitalRead() reads the digital value from a sensor pin.

Explain how an Arduino alarm system uses a sensor and buzzer to alert when triggered.

Think about the flow from sensing to alerting.

Describe the Arduino code setup needed for an alarm system with a sensor and buzzer.

Focus on pin setup and main loop actions.