Hardware Block Diagram
Main Part to build Helmet Camera
The Secret Service Surveillance System will be comprised of the following hardware components: Raspberry Pi 3,
RPi Camera (I), Fisheye Lens, PIC16F18324 Microcontroller, Proximity Sensor, Accelerometer,
and Printed Circuit Board (PCB).
Raspberry Pi 3
The Raspberry Pi 3 will be the primary device to process and stream the video footage, and it will onboard camera header
will enable us to directly connect to RPi Camera (I), Fisheye Lens.
RPi Camera (I), Fisheye Lens
The camera will be streaming with a resolution of 720 by 480 and approximately 24 frames per second. The camera module
is a custom designed add-on for Raspberry Pi that allows for both day and night vision. The Waveshare RPi Camera Module
will interface to the Pi using a dedicated Camera Serial Interface (CSI) which is designed specifically for interfacing
to cameras. The camera serial interface (CSI) bus is capable of extremely high data rates and it exclusively carries pixel
data. Eliminating the overhead associated with an IP camera.
A proximity sensor will enable the system to boot -up when the police officer puts his/her motorcycle helmet on.
This will be accomplished by utilizing a VCNL 4010 proximity sensor to sense when the police officer has his/her
helmet on. Likewise, when the police officer has his/her helmet off, the Secret Service Surveillance System will
The Secret Service Surveillance System will interface the VCNL 4010 proximity sensor with a PIC16
microcontroller via I2C and the PIC16 microcontroller will control the Enable pin of the power supply on the
printed circuit board.
An accelerometer will continuously sense the gravitational force put onto the police officer. When the accelerometer
has exceeded a specified threshold of gravitational force, the video recording will transition from black/white to color.
The primary function of the accelerometer is to indicate that the police officer has suffered any trauma to the head.
The Secret Service Surveillance System will interface the accelerometer with the Raspberry Pi 3 via I2C.
Printed Cicuit Boards
The printed circuit board (PCB) will contain the PIC16 microcontroller, the boost converter, full breakout for
battery in, control pins, and power for the Raspberry Pi. The printed circuit board (PCB) will connect directly
atop the Raspberry Pi, thus eliminating additional cables. Female header pins will be provided for the proximity
sensor, accelerometer, and the real-time clock. The Secret Service Surveillance System will be powered by one
Lithium Ion Battery Pack rated at 3.7V /4400mAh that will allow the Secret Service Surveillance System to operate
between 8 to 11 hours.