Enhancing Home Security with Technical Skills

The code in this section creates a simple and rudimentary security system that works on Arduino Uno. Before you buy an Arduino, please REGISTER AN ACCOUNT ON TINKERCAD AND BUILD YOUR TEST VERSION FOR FREE.

7/14/20232 min read

It is possible to build a simple home security system using Arduino Uno. Below is an example of a basic security system that can be built using the Arduino platform. However, please be aware that this system will be quite rudimentary and will not provide the same level of security as a professional system.

For this system, we'll use PIR (Passive InfraRed) sensors to detect motion, a buzzer for the alarm, and LED indicators to show the status of the system. You could also consider connecting the system to your WiFi network and using it to send alerts to your phone or email when the alarm is triggered, although this is a bit more complex.


  1. Arduino Uno board

  2. PIR sensor module(s)

  3. Buzzer

  4. LED(s) (optional)

  5. Resistors (optional)

  6. Breadboard and jumper wires

  7. Power supply for Arduino


  1. Connect the PIR sensor to the Arduino. Generally, PIR sensors have three pins: VCC, OUT, and GND. Connect VCC to 5V on the Arduino, GND to one of the GND pins on the Arduino, and OUT to one of the digital I/O pins - let's say pin 2.

  2. Connect the buzzer to the Arduino. Connect the positive lead of the buzzer to another digital I/O pin, such as pin 3, and the other lead to GND.

  3. (Optional) If you want an LED indicator, connect the anode (longer lead) of the LED to another digital pin through a resistor (220 ohms is a common choice), and the cathode (shorter lead) to GND.

  4. Now, you need to program the Arduino to respond to the input from the PIR sensor. Here's a simple sketch (code for the Arduino):

#define PIR_PIN 2

#define BUZZER_PIN 3

#define LED_PIN 4

void setup() {

pinMode(PIR_PIN, INPUT);




void loop() {

int pirValue = digitalRead(PIR_PIN);

if(pirValue == HIGH) { // Motion detected

digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer

digitalWrite(LED_PIN, HIGH); // Turn on LED

delay(1000); // Buzzer and LED stay on for 1 second

digitalWrite(BUZZER_PIN, LOW); // Turn off buzzer

digitalWrite(LED_PIN, LOW); // Turn off LED



This simple program will turn on the buzzer and the LED for one second when motion is detected.

  1. Upload the sketch to your Arduino board using the Arduino IDE.

  2. Now, your basic home security system is ready. You can place the PIR sensors at strategic points in your house (such as near doors or windows), and they will trigger the alarm when they detect movement.

Again, this is a very basic system. There are many ways to expand it, such as adding more sensors, using a GSM module to send text messages when the alarm is triggered, or even integrating a camera to capture images when motion is detected. However, these additions will increase the complexity of the system and may require additional hardware and programming knowledge.