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RePhone Geo Kit

The combination of GSM module and GPS module is what makes RePhone Geo Kit brilliant. The kit allows you to obtain the real-time geographic position, altitude, travelling speed and time information at any time, and all-weather conditions, through GSM network (SMS). Also as a bonus, the Xadow GSM Breakout can provides you more possibilities hacking electronics.



Microcontroller MT2502
MCU Core 32-bit ARM7EJ-STM RISC processor
Flash Memory 16 MB
Power Supply 3.3 ~ 4.2V(no SIM)/3.5 ~ 4.2V(with SIM)
Power Consumption 20mW/30mW/52mW @ standby(no radio)/standby(GSM)/standby(BT)
Quad-band 850/900/1800/1900 MHz
GPRS Class 12 modem
Clock Speed 260 MHz
Connectors 35 PIN Connector & 11 PIN Connector for Xadow Modules; JST 1.0 Connector for the battery
Interfaces LCD, Audio, I2C, SPI, UART, and GPIOs etc
Dimensions 25.37mm × 20.30mm / 1” × 0.8”

Xadow GPS v2

Microcontroller Kinetis KL02
Core ARM® 32-bit Cortex® -M0+CPU
Power Supply 3.3 ~ 6 V (via breakout pins)
Flash 32 KB
Clock Speed 48 MHz
Power Consumption 18mA@Tracking, 21mA@Acquisition
Power Saving Typ. 3mA@AlwaysLocateTM, 7uA@Backup

Mode, 180uA@Standby Mode

Channel 22(Tracking) / 66 (Acquisition)
Update Rate 1Hz(Default), up to 10Hz
Horizontal Position Accuracy <2.5m CEP
Velocity Accuracy <0.1m/s
Maximum Velocity Max.515m/s
Cold/warm start with EASYTM 215s/5s
Acquisition Sensitivity -145dBm
Tracking Sensitivity -163dBm
Operating Temperature -40℃ to 85℃
Protocols NMEA 0183/PMTK
Antenna Type Chip antenna
Interface Interface with Xadow GSM+BLE through

I2C (7-bit address 0x05)

Dimensions 25.37mm X 20.30mm / 1” × 0.8”

Xadow GSM Breakout

Dimensions 25.37mm × 20.30mm / 1” × 0.8”

Module Connection

The Xadow GSM+BLE integrates a Xadow 36 Pin connector and a Xadow 11 Pin connector. As the image shows here, if needed, you can connect the Xadow GSM+BLE to Xadow GSM breakout with a Xadow 36 Pin cable, but do bear in mind that the cable has to be inserted firmly and flat, and most importantly, keep the 'TOP' side upwards. The Xadow 11 Pin connector have much more flexible design, you can connect the Xadow GPS v2 and the mainboard with a Xadow 11 Pin ribbon cable in whatever way you want, again just make sure cable is firmly inserted.

Run a GPS Testing Code

Then copy the following GPS testing code to your Arduino IDE for RePhone. Choose the board as "RePhone" and download it with the "MTK USB Debug Port".

#include <LGPS.h>
#include <stdio.h>

void setup()
Serial.print("GPS test.\r\n");

void loop()
unsigned char *utc_date_time = 0;
char buffer[50] = {0,};

utc_date_time = LGPS.get_utc_date_time();
sprintf(buffer, "GPS UTC:%d-%d-%d %d:%d:%d\r\n", utc_date_time[0], utc_date_time[1], utc_date_time[2], utc_date_time[3], utc_date_time[4],utc_date_time[5]);

sprintf(buffer, "GPS status is %c\r\n", LGPS.get_status());

sprintf(buffer, "GPS latitude is %c:%f\r\n", LGPS.get_ns(), LGPS.get_latitude());

sprintf(buffer, "GPS longitude is %c:%f\r\n", LGPS.get_ew(), LGPS.get_longitude());

sprintf(buffer, "GPS speed is %f\r\n", LGPS.get_speed());

sprintf(buffer, "GPS course is %f\r\n", LGPS.get_course());

sprintf(buffer, "GPS position fix is %c\r\n", LGPS.get_position_fix());

sprintf(buffer, "GPS sate used is %d\r\n", LGPS.get_sate_used());

sprintf(buffer, "GPS altitude is %f\r\n", LGPS.get_altitude());

sprintf(buffer, "GPS mode is %c\r\n", LGPS.get_mode());

sprintf(buffer, "GPS mode2 is %c\r\n", LGPS.get_mode2());

Please be noted that: To obtain a better signal strength, you should put the GPS module outside the window/house in a open space. Also, after initiated the first time, it might take a while before it tracks down the satellites.

Now change the Port to MTK USB Modern Port(it's very important to so), you should be able to see the GPS info on the Serial monitor.

More Example Code

Playing with some example code would a good start if you are heading into some even more interesting project.

  1. Simply setup your sketchbook location in the preference as where you install the Arduino IDE for RePhone, then you'll be able to see the example codes.

  1. You may find the Arduino example coded manually for all the RePhone modules in the following path:


RePhone Community

We’ve been looking for a better place where our backers (RePhone Users) can sit together, warmly and comfortably, have conversations about RePhone, discuss technical problems, share ideas/projects, and give feedback on the modules’ development in the future. And then here we go, the RePhone Community.

Now join us in the RePhone Community! Together we seek answers, make interesting stuff, care about each other, and share our experiences.

Frequently Asked Questions

Some frequently asked questions in RePhone Community are collected and answered to the topic "Frequently Asked Questions of RePhone (FAQ)" , the topic will be kept updating whenever a new FAQ comes out.


Tech Support & Product Discussion

Thank you for choosing our products! We are here to provide you with different support to ensure that your experience with our products is as smooth as possible. We offer several communication channels to cater to different preferences and needs.

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