SMS based GPS tracking
Leveraging free SMS from long distance GPS tracking
I have published a project on mbed that uses a Seeed Studio SIM900 shield with an Adafruit ultimate GPS module to leverage the free SMS provided between Virgin mobile prepaid SIM cards in Australia.
A Virgin SIM charged with $30 long term credit will provide 3 months of unlimited country wide GPS tracking. The project can be configured to reply to the sender either on the event of any SMS, an SMS containing a secret request code or even a request code from a defined phone number. The system replies with the raw statistics of the GPS module such as time, heading (in both degrees and cardinal co-ordinates), speed and of course the current location. Following this, a second message is sent with the GPS location parsed into a google maps URL ready for directions / mapping.
I have also provided a basic port of the Adafruit GPS lib for the mbed compiler.
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