The article instructs users to implement location coordinates via SMS and display them to a Google Map using the SG8V1 Easy board, GSM/GPRS M95 Easy Board and GPS L70 Easy R2 board of AT-COM. Users can "Plug and Play" thanks to the flexibility of ATCBus on each product.

    1. Introduction of SG8V1 Easy 

    SG8V1 microcontroller was researched, designed by Integrated Circuit Design Research & Education Center - ICDREC. This is the first commercial microcontroller of Vietnam officially offered in the market. Chip is applied in the field of electricity, electronics, information technology ... with technical features, performance is completely competitive with imported chips of the same type.

    SG8V1 Easy is a product designed by AT-COM gives utility users the combination ATCBus with SG8V1 microcontroller series of ICDREC. The board supports USB Full Speed V2.0 through a programming kit that allows users to directly load the firmware for the SG8V1 microcontroller without any other programming kit. In addition, the microcontroller combines the Dual ATCBus Host Socket design to maximize the microcontroller resources that meet the needs of programmers deploying applications such as GSM, GPRS, GPS, Wifi, Ethernet, USB, PWM ... Especially with convenient data output, SG8V1 Easy will bring the most modern and refined design inspiration.

    2. Introduction of GSM/GPRS M95 Easy

     M95 module is a GSM/GPRS module of Quectel. M95 module operates in quad-band: GSM850 MHz, GSM900 MHz, DCS1800 MHz, PCS1900 MHz. M95 module supports GPRS class 12 multi-slot, SMS, MMS ... M95 module is integrated with Internet protocols such as TCP / IP, UDP, FTP and PPP, which is controlled by the AT Command set protocol.

    GSM/GPRS M95 Easy is a product developed by AT-COM based on the features of M95 moduleGSM/GPRS M95 Easy is designed with built-in SIMCARD antenna, GSM built-in PIFA Antenna, earphone / microphone jack for easy research and development of GSM / GPRS related applications such as: In addition, with its compact size, convenient data output, GSM/GPRS M95 Easy will bring to the inspiration of modern and refined design.

    3. Introduction of GPS L70 Easy R2

     L70 is a module of Quectel that brings the high performance of MTK positioning engine to the industrial applications with compact profile, ultra low power consumption and fast positioning capability.

    Combining advanced AGPS called EASY™ (Embedded Assist System) and proven AlwaysLocate™ technology, L70 achieves the highest performance and fully meets the industrial standard. EASY™ technology ensures L70 can calculate and predict orbits automatically using the ephemeris data (up to 3 days) stored in internal flash memory, so L70 can fix position quickly even at indoor signal levels with low power consumption. With AlwaysLocate™ technology, L70 can adaptively adjust the on/off time to achieve balance between positioning accuracy and power consumption according to the environmental and motion conditions.

    Additional feature of embedded logger function called LOCUS allows L70 to log position information to internal flash memory at default intervals of 15 seconds and provide typically more than 16 hours log capacity without adding cost.

    With its tiny design, high precision and sensitivity, L70 is perfectly suitable for a broad range of M2M applications such as portable device, automotive, personal tracking, security and industrial PDA.

    Inheriting the GPS L70 Easy product, AT-COM designs and delivers GPS L70 Easy R2 product to take advantage of the capabilities of the L70 and adds additional features such as 3V3 and 5V voltage, steady status indicator Led, Battery backup, Patch antenna integrated on the circuit. Plus, with its compact size, handy data output, GPS L70 Easy R2 will bring you the most modern and sophisticated design inspiration.

    4. The application to locate the coordinates via SMS and show up Google Map

     To implement the application we perform the following steps:

     Step 1: prepare

       • Hardware: 

                            + SG8V1 Easy board.

                            + GSM/GPRS M95 Easy board.

                            + GPS L70 Easy R2 board.

                            + Android phone has installed Google Map software and SMS2Map software .

       • Software: 

                            + SMS2Map .

     Step 2: Connect the hardware

            Insert a SIM card into the GSM/GPRS M95 Easy board then connect the GSM/GPRS M95 Easy board and the GPS L70 Easy R2 board to the SG8V1 Easy board via ATCBus and power the system.

     Step 3: Load the application code for SG8V1

     Source code in the article using the SG8-CC compiler for the 8-bit SG8V1 microcontroller. Can Download source code for SG8V1 Easy (SG8V1 M95 L70 R2 Easy demo code).

    Code after downloading to the computer should be edited and recompiled with iFast software.

    After unpacking, open the file main.c , proceed to correct the phone number in the code to send message board coordinates.

    Then we modify password of the board.

     After editing the code is complete, we compile the program into the executable file. Go to Build -> choose Build .  

     After the compilation is completed, we proceed to load the firmware for SG8V1. Connect to PC via mini USB on SG8V1 Easy board. Go to Tools -> choose SG8v1 Programming . 

    At the SG8V1 Programming interface, click Connect .

    Select Check to connect SG8V1 Easy board with iFast software.

    Select Import to get the executable file.

    The executable will be in the bin directorySelect the .srec file and click Open.

    Select Write to load the program into the SG8V1 microcontroller.


     Step 4: Implement Control to get coordinates and display to Google Map

    Once the system has finished booting, the system will automatically send a notification message to the user's phone number (the phone number is changed in step 3).



    When system startup is complete, we can get the coordinates of the system in two methods:

      Method 1: Press the SW1 button on the SG8V1 Easy board , the system sends the message containing the link coordinates.



      The system returns the message containing the coordinates.


     Method 2: Messaging SMS with the following syntax to get coordinates:


    After receiving the correct syntax message, the system returns the message with the link coordinates.

     The user click on the link in the message to display on the map, we are positioned as follows:


     * Use SMS2Map software to display the location of the system

        + Install SMS2Map software to your phone.

        + Open SMS2Map on your phone then you can press SW1 button on Easy SG8V1 or messaging to get coordinates to phone by syntax:


        + When the message contains the coordinates sent to the user's phone number, SMS2Map will automatically display the location on the map of the software.


     + When the user clicks on the map, the software displays the address of the current system.