RePhone Lumi Kit


RePhone Lumi Kit is specially designed for LED lovers - embedding the Xadow GSM+BLE module into your awesome lighting device and control the light via SMS or Bluetooth!



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 Duino

Microcontroller ATmega32u4
Power Supply 5V via USB, current draw is 1.5A at Max 3.3 ~ 4.2V via battery socket, current draw is 1.5A at Max 3.3 ~ 6V via breakout pins, current draw is 500 mA at Max 3.3 ~ 4.2 V via Xadow GSM+BLE, current draw is 500 mA at Max
Charging Current 500 mA
Flash Memory 32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM 2.5 KB (ATmega32u4)
EEPROM 1 KB (ATmega32u4)
Clock Speed 16 MHz
Connector 2 × 11 PIN Xadow Connector Bonding pads for RGB LED WS2812b
Interfaces Interface with Xadow GSM+BLE through I2C (7-bit address 0x23)
Dimensions 25.37mm × 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, 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 Duino and the mainboard with a Xadow 11 Pin ribbon cable in whatever way you want, again just make sure cable is firmly inserted.

Control the Light with SMS!

Here is an example of controlling you RGB LEDs by sending a message to your RePhone.

Firstly you need to follow the instructions in the Arduino IDE for RePhone Kit to download the Arduino IDE for RePhone Kit as well as install the drivers. Then copy the following code to your Arduino IDE for RePhone. Choose the board as “RePhone” and download it with the “MTK USB Debug Port”.

#include <LCheckSIM.h>
#include <LGSM.h>
#include <LWs2812.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

//SMS command 0 : "OFF" - off display.
//SMS command 1 : "R100G0B0" - red color is 100, green color is 0, blue coler is 0.
char num[20];
char buf_contex[200];

void setup()
    Serial.print("Ws2812 test.\r\n");

void loop()
    unsigned long rgb_color;

        LSMS.remoteNumber(num, 20);
        LSMS.remoteContent(buf_contex, 50);

        Serial.println("Get new sms: ");



        if(strcmp("OFF", buf_contex) == 0)
            Serial.print("RGB off.\r\n");
            LWs2812.monochrome(5, 0, 1);
            if(StingFind(buf_contex, "R", 1))
                if(StingFind(buf_contex, "G", 1))
                    if(StingFind(buf_contex, "B", 1))
                        Serial.print("RGB flag is find.\r\n");
                        char color_r[4] = {0};
                        char color_g[4] = {0};
                        char color_b[4] = {0};

                        sscanf(buf_contex + 1,"%[^G]", color_r);
                        sscanf(buf_contex,"%*[^G]G%[^B]", color_g);
                        sscanf(buf_contex,"%*[^B]B%[^\0]", color_b);

                        rgb_color = atol(color_r)*256*256 + atol(color_g)*256 + atol(color_b);

                        Serial.print("rgb color is ");
                        LWs2812.monochrome(5, rgb_color, 0);
                        LWs2812.monochrome(5, rgb_color, 0);

int StingFind(char* string, char* find, int number)
    char* pos = string;
    char* p = string;
    int count = 0;

    while(number > 0)
        pos = strstr(p, find);
        if(pos == 0)return -1;

        while(p <= pos)
            if(*p > 0x80 || *p < 0)
                p ++;
            p ++;
            count ++;
        number --;
    return count;

In this code we set the SMS command as: ··· “OFF” - off display. “R100G0B0” - red color is 100, green color is 0, blue coler is 0. ···

So if we send “R100G0B0” to the RePhone, the LEDs will become red as showing below:

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.


Please go the Wiki page Xadow Duino for more info.

Help us make it better

Welcome to the new documentation system of Seeed Studio. We have made a lot of progress comparing to the old wiki system and will continue to improve it to make it more user friendly and helpful. The improvement can't be done without your kindly feedback. If you have any suggestions or findings, you are most welcome to submit the amended version as our contributor via Github or give us suggestions in the survey below, it would be more appreciated if you could leave your email so that we can reply to you. Happy Hacking!