Enhance my ideas and help me make better system

I am using PIC18F46K80 PDIP, 8 MHz external crystal with 4X PLL and SIM908 (ITead SIM908). My system is Accident Notifier and Anti theft. My system will have three sensors connected to INTx pins. One sensor is Crash Sensor. When there is a Crash it sends alert SMS to mobile numbers (1 to 10) stored in eeprom. SMS will be like "Vehicle of model x and number y has met with an accident". Then it tries to get locked GPS data and if it gets then it extracts latitude, longitude, data and time from GPS and then formats it as required for SMS and then again sends SMS like "Vehicle of model x and number y has met with an accident at latitude z, longitude p, on date q at time r to all the numbers stored in eeprom. Another feature is Anti-theft system. It uses vibration sensors. One vibration sensor is fixed to the vehicle and another will be in the locked enclosure of the Accident Notifier and Anti theft System (ANATS). Lets say if you park your vehicle then you have to send an SMS from the registered mobile number like "Activate". On receiving this SMS the system the Anti-theft system activates. If anybody tries to move the vehicle or tamper with the enclosure containing (ANATS) then it immediately sends SMS "Vehicle movement detected" to all the numbers stored in eeprom. After this it tries to get GPS data every say 5 minutes and sends the latitude, longitude and time to the mobile numbers like "Vehicle is currently at latitude x, longitude y at time z" It keeps sending SMS every five minutes and stops only if SMS "Deactivate" is received.

Can I improve the system in any other ways ?

The system will run on a 9V 10Ah battery which has to be charged say once every week from 230V AC mains. The system will be fitted in a safe place inside the vehicle which cannot be easily accessed. Only the GPS antenna will be outside.

The cost of the unit will be Rs.5000.

Let's say, I can develop such system and it will work from 300mAh Li-Ion signle cell battery for a month without recharging...

Can it work ? I am using SIM908 for one system and Telit GSM for another. SIM908 requires 2A current while sending SMS. How can such a system work from 300 mAh battery ?

If it is possible for a GSM system to send SMS and GPS to get NMEA data at such low current then please mention what GSM and GPS systems they are ?

I will see if I can use them in my products.

I don't think that starting discovering microcontrollers from developing such powerfull system is a good idea. Especially if you planing to sell it. I'm developing embedded systems for 10 years and can't just say that I will take this, this and this, combine them and sell for 5000. Will it work or not? Who cares?

Buy I have already make such a system using SIM908 and it is working fine. I need some ideas to enhance my system by implementing more features.

I am designing another similar system which uses

https://www.mikroe.com/pic/clicker/

https://www.mikroe.com/click/gsm2/

https://www.mikroe.com/click/gps/

which work from 3.3V.

It will be a tiny device including its own 6V 4Ah battery with one crash sensor and two vibration sensors. It can fit into any vehicle. It is configured and activated/deactivated by sending SMS only from owner mobile.

milan.rajik said:

The system will run on a 9V 10Ah battery which has to be charged say once every week from 230V AC mains.

Click to expand...

that is a bad idea

how to enter the mobile number?
what if the phone is lost or off?
no escalation?

Initially one has to send SMS from the mobile of the owner and on receiving the first SMS it extracts the mobile number from SMS +CMGR header and then sends a confirmation SMS like "To Confirm SMS YES, to CANCEL SMS NO". If the user sends SMS YES from the same mobile then it saves the mobile no. to eeprom and sends an SMS that setup is complete and then sets a flag in eeprom to indicate that SMS is complete. If the system is reset then it reads this flag and enters run mode as setup is already complete. There will be one button to enter setup mode but that can only be used if system is not activated. If you have parked your vehicle then you have two options to activate the system. One is press the button. After pressing button, a timer of 2 minutes starts and after completion of two minutes the system will be activated and the button will be disabled. The other way is sending an SMS from owner mobile like "Activate" will activate the system after 2 minutes. To deactivate the only way is to send SMS "Deactivate from owner mobile" The system except the GPS antenna will be in an locked metal enclosure with its own battery and charging circuit. There will be a jumper on the main board which if configured can enter setup mode again. Used when mobile is lost. When system is activated if anybody tries to tamper with the lock of the system then it immediately sends alert SMS one without GPS data and another with GPS data. It need 5V 2A power supply. Always powered from battery because when accident occurs the main vehicle battery or its connection can get damaged or the thief may cut the power supply wires.

I thought about using solar panel to power the system but the vehicle thief can cut the wires of the solar panel and hence I used battery.

I have got the SIM908 board from iTead customized. The SIM908 board from iTead has headers and non lockable SIM holder. I can't use then in automobile system as there will be vibration and the header wires can disconnect and SIM can come out of its socket. I got the board customized with lockable relimate connectors and lockable SIM holder.

What better suggetions can you give for my design and program ? The system is in Prototype stage but I can make changes to hardware and code.