Can this be build
what parts/ components would I need to use?
it has to have low power consumption.
Probably it would also log the coordinates to a SD card.
since it would be used for geocaching, it has to have low power consumption
In addition to sending you an SMS each time it moved more than a certain amount?
How long do you need it to run for, and what sort of batteries did you envisage using?
Do you need any sort of reliable movement detection, or are you happy to say that movement detection is only possible when it has satellite visibility?
I probably would use a mechanical tilt-switch.The device could be build to remain in sleep mode (power saving!) until someone picks it up and the tilt-switch triggers an interrupt to wake it up.
An external RTC can wake the Arduino any number of times a day. The Arduino can power the GPS, wait an eternity for the GPS to come to life and return a reading, wake the GSM shield, send the message, and then go back to sleep.
And how much measurings (both Gyro and GPS) would a 10gb SD card would be able to save.
QuoteAnd how much measurings (both Gyro and GPS) would a 10gb SD card would be able to save. How many buckets can my barrel hold? If you want to store one reading a day, you could probably store a couple of centuries worth of readings. Store more often and the duration goes down.How you store the data matters. How much data you store matters. How often you store the data matters. In which file(s) you store the data matters.
2 readings a day, .text file, a line where's written time and coordinates.