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  • Author Author: Kilohercas
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Multipurpose custom GPS/GSM alarm

Kilohercas

Hello,

I am planing to buy new car and i am 5 months short,so i decided to use this time to develop GPS/GSM tracke based on SIM5320E for my future car. Since i like do that kind of stuff myself, i stared to collect parts for it. At the moment, alarm system will have this futures:

 

  • Two reed switched for doors
  • One reed switch for trunk
  • One read switch for hood
  • One reed switch for fuel filler cap
  • Four reed switches for lamps, if any one try to remove it
  • One contact-less temperature sensor for engine compartment
  • One contact-less temperature sensor for passenger compartment
  • Motion sensor for passenger compartment
  • Fuel pump cutoff via SMS
  • 4500mAh battery for 1 weak operation without main lead acid battery
  • Compass/accelerometer if some on try to tow the car.
  • Single reed switch for disabling alarm, so i can drive it image
  • Get GPS coordinate request triggered by SMS with correct text
  • Call and listen what's happening inside the car, also speaker is possible to add too

So basic idea, i have lot of reed switches, and if any one is triggered, as example some one will open door, it will send SMS message with error code and location ( simple Google maps link, that will generate flag on top of current location with ~1m error). example of sms message : "Fuel filler cap error http://tinyurl.com/p9sk9wb "

 

Second line of defense is temperature sensors (MLX90614), if one of two sensors will go above temperature threshold, SMS with error code is send, and i still don't know will i add CO2 gas release valve, so it can put off fire with no damage if that was false alarm is generated.

 

Third line of defense is MEMS compass/accelerometer, If any one try to tow car, gps compass will generate that car just made a turn, that means, some one try to tow it. If accelerometer event is captured, that will means that some one parked inside your car.

 

All electronics, charging circuitry , GPS/GSM modem, and battery will fit inside 80x53x24mm aluminum box, and will have two RF connectors for GSM/HSDPA and GPS antennas , that can be mounter above glove box, or on top of the roof. Each reed switch will use only single wire from my electronics, and it will be grounded in series with reed switch, so when magnet is removed, it will generate low level signal for my electronics, while default state will be pulled high inside electronics, so standby current is minimized as well as wiring is simple.

image

 

So first question for element14 members, does any one have idea for simple but useful future that can be added to this system ? But it must be simple to make, since i am a bit limited by my programming skills.

 

And second question, does any one woulds like to have system like this in your own car ? Only parts will cost around 150$ and i still need to make o profit. Because if more than ten people would want this system inside the car, i will need to add USB programming option for phone numbers, and so on, and it is more complex that just program my phone number into micro controller flash.

Parents Comment Children
  • in reply to Former Member

    Hi, only SIM5218 support GPS.

     

    camera interface would be nice to have, but this system is complicated as it is. My goal is somehow to get lower power operation in 50mA range, because larger current drain will cause me problems.

     

    Also was able to make position based on Cell tower work. So even if some one try to block it, 1km circle is enough to get your car back. Also, i already have SIM5320E, so i don't plan to use other platform ( well, it would be nice to get SIM5360, since it can work with glonass).

    One of the biggest problem was to make text interpreter from AT commands, since i want to implement a lot of functions, that will be fun image

  • in reply to Kilohercas

    Yes I understand power consumption as I'm facing similar issues, but there are ways of powering u/down parts of the system if not immediately required, either on a time schedule or from an event.

     

    Regarding the AT commands, there's an online tool referenced elsewhere on this site forum or see here: http://m2msupport.net/m2msupport/software-and-at-commands-for-m2m-modules/

    which is useful for trying things out, although doesn't have all commands for all modules. Alternatively, I generally use terminal program such as Putty and and paste commnds in from a list or text file, saves a repetitive typing, errors etc. while protyping a group of AT  commands to work together.

     

    Don't forget LUA, I've no experience of this yet, but appears the SimCom modules will run an LUA script internally, which might eliminate the need for an external controller entirely and simplify the hardware.

     

    Cheers

    James