Vehicle Monitoring System Michael Jermann Chris Blount Team: 35 TA: Justine Fortier

Introduction Improvement on traditional car-alarm systems Uses high-speed cellular networks to: ▫Decrease noise pollution ▫Improve car-alarm effectiveness

Key Features Send image to cellular handset via MMS Allow user to remotely activate car alarm operation via SMS Compatible with existing car alarm systems

System Overview Microcontroller ▫Arduino Mega 2560 Camera Module ▫C328R GPRS Module ▫Arduino Shield with SIM900 chip Car Alarm Control Circuitry ▫Relay ▫Resistors Power Supply ▫12 V input ▫5V and 3.3 V outputs

Block Diagram Car Alarm Control Circuitry Microcontroller Camera GPRS shield Power Supply

Microcontroller Overview Arduino Mega 2560 Rev. 3 ▫ATmega2560 Microprocessor ▫4 UARTs ▫54 digital pins ▫4 KB of EEPROM

Microcontroller Design

Car Alarm Control Circuitry

Car Alarm Control Circuitry Overview Original Relay: RZ03-1A4-D012 ▫Contact Rating: 12 VDC, 16 A ▫Input Requirements: 5 VDC, 33 mA ▫Inconsistent operation due to current requirement Switched to SainSmart 5V Relay Module for Arduino ▫Contact Rating: 30 VDC, 10 A ▫Input Requirements: 5 VDC, 20 mA

Car Alarm Control Circuitry Design Digital Input 10 – When high, initiate operation Digital Output 11– When high, allow 12VDC signal to reach siren

Relay Testing Detect security incursion ▫“OFF” voltage = 0 VDC ▫“ON” voltage = 4.11 VDC Control car alarm operation ▫“OFF” voltage = 0 VDC ▫“ON” voltage = VDC

Camera

Camera Overview C328R ▫3.3v with 60 mA needed ▫UART interface ▫JPEG compression

C328R Design Power ▫3.3V from Power Supply GND ▫Ground Tx ▫Rx1 of Arduino Rx ▫Output of voltage divider of Arduino Tx1 ▫(PIC)

C328R Testing Arduino Library ▫SYNC  ACK ▫Set Baud rate  9600 bps ▫Initial  JPEG 128x160 ▫Get Picture

GPRS Shield

GPRS Overview Shield designed by Seeed Studio for use with Arduino microcontrollers ▫Breakout board for SIM900 GSM/GPRS chipset ▫Insert unlocked SIM card for access to cellular data networks ▫Control operation through “AT” commands through UART ▫Supports SMS/MMS

GPRS Software: MMS

GPRS Software: SMS

GPRS Testing MMS ▫Successfully connect to cellular MMSC within 60 seconds of initialization ▫MMS received by user within 120 seconds of security incursion SMS ▫Relay output activated within 20 seconds of SMS message being sent

Power Supply

Power Supply Overview TI TPS54383 (First Design) ▫Dual output Buck Converter ▫Design Failed. New chip design for single output. TI LM2576 (Final Design) ▫5V 3A Voltage Regulator ▫Simple buck converter TI LM317T (For added reliability) ▫Linear Regulator ▫5V to 3.3V

Power Supply Design LM2576 Courtesy TI LM2576 Datasheet

Power Supply Design LM317T Courtesy TI LM317T Datasheet

Power Supply Testing

Power Supply Efficiency Tested over a resistive load: Input Power ▫192 mW Output Power ▫76.96 mW Efficiency ▫40.0%

Power consumption Full system without GPRS powered on ▫169 mA -> 2.03 Watts Full System with GPRS powered on ▫184 mA -> 2.21 Watts Did not meet 100 mA goal

Individual Power Consumption Stand alone consumption: Arduino ▫77.7 mA -> 932 mW C328R Camera ▫.67 mA -> 2.2 mW SIM900 GPRS ▫17.9 mA -> 89.5 mW Relay <-Cause of verification failure ▫137.8 mA -> 689 mW

Recommendations Implement a more efficient power supply Use a one output relay for greater efficiency Add SD card to Arduino for higher resolution pictures and permanent storage Higher resolution camera

Project Synopsis ChallengesSuccesses SIM900 chipset poorly documented Multiple power supply redesigns Camera reliability issues Achieved full system functionality Comfortable with Arduino Generally exceeded performance requirements

Ethical Considerations False incrimination ▫Real-time monitoring Privacy Invasion ▫Professional installation required Law Enforcement Surveillance ▫First amendment rights

Questions?