Rephone Core 2G-AtmelSAMD21

RePhone is one of the most unique and interesting development board platform that created by Seeed Studio, ever since its first show on the stage of KickStarter, it has received tons of attention and support from makers all over the world because with RePhone you can not only DIY a special phone for yourself, but also enchant things around you with cellular connectivity.

The RePhone Core 2G-AtmelSAMD21 v1.0 is a new Arduino compatible RePhone core 2G board, which is based on Atmel’s SAMD21 and SIM800H, Most features of RePhone Core 2G-AtmelSAMD21 v1.0 is the same as Xadow – GSM+BLE, such as offering rich range of communication protocols – GSM, GPRS, and Bluetooth, supporting quad-band 850/900/1800/1900Mz, and supporting 2G Nano SD card. But the solution of Atmel’s SAMD21 plus SIM800H has dropped power consumption a lot comparing to Xadow – GSM+BLE. If you are looking for a high-performance and low power consumption Rephone core to enchant the world, the this new RePhone core 2G module is the best choice.

The RePhone Core 2G-AtmelSAMD21 v1.0 is compatible with all the Xadow v2.0 except the Xadow 1.54 inch Touchscreen
Please connect a battery to the board if you want to use the GSM or GPRS function in case the power form USB is not enough and fail to communicate.

danger

This product **DOESN'T** include a lopo-battery, and there's no lipo-battery sold at our Bazaar as well, any 3.7V lipo-battery will work.

This product **DOESN'T** include a Mic, Speaker and 3.5mm handset input, you need to buy a [Xadow Audio](https://www.seeedstudio.com/Xadow-Audio-p-2554.html) for those function.

Features

Arduino/Processor

ATSAMD21G18 @ 48MHz with 3.3V logic/power
Arduino compatible (based on Arduino Zero bootloader)
Embedded with lithium battery management chip
User button

SIM800H

Quad band850/900/1800/1900MHz
GPRS multi-slot class 12/10
GPRS mobile station class B
Meet the GSM 2/2 + standard
- Class 4 (2 W @850/900MHz)
- Class 1 (1 W @1800/1900MHz)
bluetooth:compatible3.0+EDR
FM:band limits 76~109MHz,Tuning step by step 50KHz
Via ATcommand control 3GPP TS 27.007, 27.005 and SIMCOM enhance ATcommand set
SIM USAT
Low power
Operating temperature range : -40 ~+85 °C

Specification

Item	Value
Microcontroller	ATSAMD21G18, 32-Bit ARM Cortex M0+
Operating Voltage	3.3V
DC Current per I/O Pin	7 mA
Flash Memory	256 KB
SRAM	32 KB
EEPROM	None
Clock Speed	48 MHz
Lenght	68 mm
Width	30 mm
Weight	12 gr.

Hardware Overview

1- 11pin Xadow Connector
2- User Button(D3)
3- Micro USB connector for programming and power
4- 35pin Xadow Connector
5- Jst1.0 Battery Connector
6- Nano Sim Card (same to iPhone 5/6/7)
7- ATSAMD21G18 IC
8- Charge status monitor LED
- blink - no battery insert
- on - charging
- off - charge done
9- IC - ETA6003(datasheet)
A- SWD Debug port
B- Antenna Connector
C- I/O PIN pad
D- SIM800H

##Pin map

tip

[Click](https://files.seeedstudio.com/wiki/RePhone-core-2G-AtmelSAMD21/img/pinmap.png) to view larger image.

note

* INT1 connect to D7
* INT2 connect to D12

##Arduino IDE

After you download and install the latest Arduino IDE, there's something need to set up. Open your Arduino IDE, and click on File > Preferences Copy blow code to Additional Boards Manager URLs, and then OK

https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_legacy_seeeduino_boards_index.json

Then let's go to Tools > Board > Boards Manager

Click on the Install button and wait for minutes before the board is installed.

After the install is completed, you can find RePhone core 2G-AtmelSAMD21 at the bottom of Tools > Board.

Install the Driver (For Windows)

When the first time to insert the board, you should get a USB COM device name RePhone 2G SAMD21 that need to install a driver. Click on the below button to download driver for the board.

To make sure the driver was installed successful, open your Device Manager to see if RePhone 2G SAMD21 exists.

###Hello World Now we can upload our first demo - Hello World to the board.

Open your Arduino IDE copy the blow code:

void setup()
{
    SerialUSB.begin(115200);
}

void loop()
{
    SerialUSB.println("Hello world!");
    delay(1000);
}

And Then,

Click on Tools > Board > RePhone core 2G-AtmelSAMD21
Click on Tools > Port to select a right port number. (Don't choose COM1)

Then click on the Upload button on the left-top of Arduino IDE, seconds later the sketch was uploaded successful.

If the uploading is success, you should the some info in red.

Open Serial Monitor of your Arduino IDE and you will get "Hello World" printed per seconds.

AT Command Mode

RePhone core 2G board support AT command mode. TX/RX of SIM800H is connected to Serial1(D0/D1) of AtemlSAMD21.

Copy the below code and upload to your board.

#include "atmelsamd21_gprs.h"

void setup()
{
    SerialUSB.begin(115200);
    while(!SerialUSB);

    SerialUSB.println("RePhone core 2G - AtmelSAMD21 AT Command Test");
    gsm.preInit();                  // power on

    while(0 != gsm.init())
    {
        SerialUSB.println("GSM init error.");
        delay(2000);
    }

    SerialUSB.println("GSM init ok.");
}

void loop()
{
    while(SerialUSB.available())Serial1.write(SerialUSB.read());
    while(Serial1.available())SerialUSB.write(Serial1.read());
}

Open your Serial monitor and wait for GSM init ok. printed on the monitor, then you can input a command. Try to input an "AT" to get an "OK".

tip

All command must be end with a new line(\r\n).

Click on below button to get detailed AT command documentation.

Examples

We had made many examples to show you how this module work. At the every beginning, please

Insert a nano SIM card
Insert the antenna
If you got a lipo-battery, insert it to the board as well

Click on File > Examples then you can open those examples. ###AtmelSAMD21_SIM800

Bluetooth_AT_Command_And_Music_Play: Play music via bluetooth
GSM_GPRS_HTTP_GET: Http get hello.txt from mbed.org
GSM_Receive_SMS: Receive SMS
GSM_Voice_Call: Receive voice call

###RePhone_API_for_Arduino

gps_test: Xadow GPS v2 example
ledmatrix_test: Xadow LED 5x7 example
nfc_test: Xadow NFC v2 example
sensorhub_test: Xadow Basic Sensors example
ws2812_test: Xadow Duino example

###rephone_button

button_test: On-board button test

###rephone_lcm

lcm_display_test: LCD display exampledkdsafdfds

###rephone_menu_all

rephone_menu_test

###TwilioMessage

message_test: Twilio Message Send/Receive

RePhone Family

There are several chainable add-on modules to extend the features and functionalities – Xadow Audio, Xadow LED 5x7, Xadow Basic Sensors, Xadow Duino, Xadow GPS v2 and Xadow NFC v2.

GPS v2	Basic Sensors	NFC v2

Get More Details	Get More Details	Get More Details

LED 5 x 7	Audio	Xadow GSM Breakout

Get More Details	Get More Details	Get More Details

Schematic Online Viewer

Resources

Tech Support

Please submit any technical issue into our [forum](https://forum.seeedstudio.com/).

Features​

Arduino/Processor​

SIM800H​

Specification​

Hardware Overview​

Install the Driver (For Windows)​

AT Command Mode​

Examples​

RePhone Family​

Schematic Online Viewer​

Resources​

Tech Support​