SimValley GT-170 GPS tracker internals

How does this tracker work? You plug in a SIM card, configure the tracker and put it somewhere. Then, using your (smart) phone, you send your tracker a certain SMS  – A few seconds later, the tracker will send its own GPS coordinates in a new SMS message!

SimValley GT-170 GPS tracker 1

And a click on the received SMS message will show you the location of this GPS coordinates on Google Maps.

SimValley GT-170 GPS tracker 2

I’m always interested in how the things internally look like – So I opened my GPS GSM tracker.

SimValley GT-170 GPS tracker

Chips found inside:

  • Eon Silicon Solutions cFeon EN71GL064B0-70CWP (flash memory, pseudo SRAM)
  • Skyworks SKY77547-11 (Tx-Rx front-end module-quad-band GSM/GPRS)
  • MediaTek ARM MT6223DA (GSM/GPRS baseband processor with ARM core)
  • Othello AD6548 (GSM/GPRS quad-band RF transceiver)

Chip inside the box on the other side labeled ‘J214809D6’: GPS receiver ?

Contacts found inside:

  • GND, SDA, SCL, VDD, GPO
  • GPS_VBK, GPS_TX, GPS_RX, TX, RX, VCC, ON, GND
  • GSM_ANT
  • VBAT, GND, CHG
  • PWRKEY, GND, SPK+, SPK-

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A blog on projects with robotics, computer vision, 3D printing, microcontrollers, car diagnostics, localization & mapping, digital filters, LiDAR and more