Security Watch

Abstract

Security Watch or Cam Pack is the surveillance App/Device that turns your iPhone into an instant spy. Use the Bluetooth Camera Device to stream live of what’s happening behind you. Perfect for situations when you feel the person is suspicious or ready to rob/assault you from behind. The device is worn like an watch on your wrist. The device captures the video and transmits to Mobile App through Bluetooth. The App takes care of the rest. The app has a panic button which calls to 911 immediately in case of any danger.

Features

Stream Video: Security Cam links two devices (Phone and Embedded Device) together to create an instant surveillance camera setup. Set up in an inconspicuous spot through the wrist where the device will be worn and watch on your mobile app.
Record Video: You can discreetly control recording and streaming and Recorded videos save to the streaming the Phone’s app storage.
Wireless: Using Bluetooth to connect the devices makes Security Cam extremely versatile. Set up the surveillance App anywhere – no Wi-Fi or carrier signal needed. Connects to your smartphone wirelessly.
Upload And Share: What fun is secretly recording video if no one sees it? Upload captured videos to your contact in case of any emergency. Once you hit the panic button on your mobile app, the App takes care of the rest.
Be Protected: In case of any emergencies just hit the call 911 button on your mobile and the police arrive at your place within minutes. The police will also be intimated with your exact location since they have your GPS location through the mobile.

Security Cam Device

Lot of R&D was put into making the device. The main objective was to capture the video and send it to the Mobile App. But How? The first part of the project was to capture the video, for that we tried the camera TTL Serial JPEG Camera with NTSC Video. It was designed to be used in security systems and does two main things – it outputs NTSC video and can take snapshots of that video (in color) and transmit them over the TTL serial link.

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Figure 1.TTL Serial JPEG Camera with NTSC VideoSystem

You can snap pictures at 640×480, 320×240 or 160×120 and they’re pre-compressed JPEG images which makes them nice and small and easy to store on an SD card. This particular camera has many add-ons that come with it. For example adjustable focus, auto-white-balance, auto-brightness and auto-contrast will all be taken care of with motion detection built in, which makes your work more simpler and easier.

Specifications

Frame speed: 640*480 30fps
Scan mode: Progressive scan
Viewing angle: 60 degrees
Monitoring distance: 10 meters, maximum 15meters (adjustable)
Image size: VGA (640*480), QVGA (320*240), QQVGA (160*120)
Baud rate: Default 38400 (the datasheet claims you can change the baud rate with a command but it does not work reliably)
Current draw: 75mA
Operating voltage: DC +5V
Communication: 3.3V TTL (Three wire TX, RX, GND)

Hardware Used

Microcontroller – Freescale’s mk20dx256
Bluetooth – Nordic Semiconductor’s nRF 51422
Camera – OV7670
Display ST7735