The aim of this project is to demonstrate the power of an Arduino and Arduino software is used to develop a Surveillance device that transmits information via Bluetooth to an Android application. Safety and Security have always been a top priority for us. Installing a surveillance camera with night vision, tilting, and panning options will burn a big hole in our pocket. Thus, we should create an affordable device with similar functions but without video. Using an ultrasonic sensor, it detects objects and can therefore be used during the night as well. We are also mounting the ultrasonic sensor on a servo motor, which is able to scan an area automatically or manually, depending on whether it is set up for automated rotation or whether it is manually rotated via our Mobile app, our ultrasonic sensors are focused in our preferred direction, allowing us to detect objects nearby. With the US sensor, we will be able to broadcast selected information to our smart phone, similar to a sonar or a radar.

A +5V power supply ( I am using my Arduino (another) board for power supply) Arduino Mega (You can use anything from pro mini to Yun) Servo Motor (any rating) Bluetooth Module (HC-05) UltraSonic Sensor (HC-SR04) Breadboard (not mandatory) Connecting wires Android mobile Computer for programming Arduino Software

Android SDK Processing Android (To create mobile application)

Let's start building the hardware once we have the materials ready. For ease of understanding, I have divided the tutorial into two parts: the Arduino Part and the Processing Part. The tutorial's code is complete and can be used directly by anyone who has no experience with Processing. The servo motor, Bluetooth module, Ultrasonic sensor and other components all play an important role in the project. As such, beginners should start with some tutorials that cover these components before returning to this one. Here are our various projects involving Servo Motors, Bluetooth Modules, and Ultrasonic Sensors.

In this project, the Arduino is not responsible for powering any components as the servo motor, Bluetooth module and US sensor all draw a great deal of current that the Arduino cannot supply. Therefore, any external +5V power supply is highly recommended. I have used two Arduino boards to share the components when I did not have access to an external +5V supply. A second Arduino mega board (red colour) has been used to power the Servos. I have also mounted the Bluetooth module HC-05 and the ultrasonic sensor HC- SR04 on the Mega. CAUTION: The voltage regulator on the Arduino will be damaged if all these modules are powered with one Arduino board. To mount the sensor, I used a piece of junk I had in my junk box, along with

double-sided tape. To do the same, you can think of your own idea. Markets also offer servo holders for use with the same type of device.

To install the same application used in this tutorial if you do not want to make your own application, you can follow the steps below. Figure. Zealotbt App 1. This APK app is compatible with Android version 4.4.2 and above (Kitkat and above). The APK file can be downloaded directly from the link below. https://circuitdigest.com/sites/default/files/Radar-zealotbt_1.0_apk_file.zip (App Name: Zelobt) 2. APK files should be transferred from your computer to your phone. 3. Make sure your Android settings allow you to install applications from unknown sources.

4. Install the application. If the app was successfully installed, you will see " Zelobt " installed as shown below. At this point, both the hardware and software are ready. Your Bluetooth module should be powered on and paired with your mobile device. You should see your Bluetooth module (HC-05) automatically get connected to your phone once you have paired them. Open the "Zelobt" application we just installed and wait a second. You will get the following message once the connection has been

Figure. Radar data in the zealotbt mobile App The top of the screen shows you that it is connected to: Device name (hardware address). Moreover, it shows the angle of the servomotor and the distance between the US sensors. On the red background, a blue graph is also plotted based on the measured distance. In the blue region, the closer the object, the taller it becomes. A mobile app can be used to control your servo motor, as we mentioned earlier. You can stop the servo from sweeping automatically by clicking the stop button. On the bottom of the screen, you will find a circular wheel that will rotate clockwise or anticlockwise when swiped. If you swipe this wheel, your servo motor will also turn in the same direction.