Maduino GPRS A6

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Maduino GPRS A6 is a one-stop solution for IoT (Internet of Things) projects, it integrates a micro Controller Atmega 328, GRRS/GSM module A6, on-board power management and storage, to make the Maduino GPRS A6 ready for real project for IoT projects such as smart-home, outdoor monitoring, shared bicycle, etc. The GRPS/GSM module A6 support quad-band 850/900/1800/1900MHz, that covers any GSM network, after inserting a SIM card, then you will able to use the SMS/GPRS service of Cellular connectivity.
The Maduino GPRS A6 based on the Arduino, users can program it with Arduino IDE, which is very easy especially suit for the none-programmers. There is also detailed guide for users to learn how to create the first IoT project with Maduino GPRS A6 board, with which the starters can learn the hardware and programming skills quickly.

Model: OAC000MA6
Maduino GPRS A6.jpg


  • Powered by lithium battery 3.4-4.2V or USB
  • ATmega328: 8MHz, 32KB flash, 2KB SRAM
  • Integrated Power Control System
  • Quad-band: 850/900/1800/1900Mz
  • Interface: I2C/SPI/UART/18*GPIO
  • Arduino Compatible
  • Working Temperature: -20 – 85℃
  • Default baud rate: 115200
  • Size: 40*55mm

Interface Function

Maduino GPRS A6 1.JPG
①PWR: Power Indicator
②CHG: Charge Status Indicator
③VBAT: Lipo Battery Connector
④CHG: 5V power Input Connector, connect to the solar panel to charge the battery.
⑤Micro USB: 5V Power Input, USB to serial Communication
⑥RESET: Reset Button for ATmega 328
⑦Serial Port Select:
D0&D1: Hardware serial port;
D7&D8: Software serial port;
⑧A6 Serial Port for Firmware Updates
⑨GSM: Antenna IPX Connector

Maduino GPRS A6 2.JPG

①Micro SIM Card Holder
②Micro SD Card Holder

Pins usage on Arduino

  • D0 – RX from A6 (Hardware Serial Communication Selected)
  • D1 – TX to A6 (Hardware Serial Communication Selected)
  • D2 - Unused
  • D3 - Unused
  • D4 - SD Card CS PIN
  • D5 - Low-Power Mode Control of A6 (Low active)
  • D6 - Power OFF Control of A6 (High active)
  • D7 - RX From A6 (Software Serial Communication Selected)
  • D8 - TX to A6 (Software Serial Communication Selected)
  • D9 - Power ON Control of A6 (High active)
  • D10 - Unused
  • D11 - Unused
  • D12 - Unused
  • D13 - Unused
  • D14(A0) - Unused
  • D15(A1) - Unused
  • D16(A2) - Unused
  • D17(A3) - Unused
  • D18(A4) - Unused
  • D19(A5) – Unused


GSM Connectivity

With the Maduino GPRS A6, users can create IOT projects such as remote controlling. The following simple application is using the SMS to control a RGB LED, it would be convenient for remote controlling without any internet, only with the 2G GSM connectivity that you can control hardware remotely.
1.Insert a Micro SIM card
The Maduino GPRS A6 board uses the micro SIM card that is widely used in Android phone, install the Micro SIM card to the holder as below picture.
Maduino GPRS A6 6.JPG
Note that some fee maybe needed for each SMS depends on your local GSM Operator, make sure that the SIM Card is active and enough money left for this application.

2.Connect the GSM Antenna and the 3.7V battery
Maduino GPRS A6 7.JPG
3.Connect the module that you want to control by Maduino A6.
Connect an RGB LED module to the Maduino GPRS A6 as the following connection:
RGB LED Module-----Maduino GPRS A6


Maduino GPRS A6 9.JPG
Actually you can connect plenty of other modules that can be controlled by the simple On/Off Commands. For Example, a Relay can be connected, to control the AC110V or 220V connectivity, and a DC motor can be connected and controlled, to created Automatic agriculture applications.

4.Programming and Download
The Codes for this application is simple, firstly, define the control pins: (Demo Code Download)

//define the RGB LED connection to the Maduino GRPS A6:
int LED_R = 2;
int LED_G = 3;
int LED_B= 4;

When some characters are received, turn on/off the related LED color:

SerialInByte = (unsigned char);
if( SerialInByte == 13 )// if some charactors are received from the A6;

Turn On/Off t the LED, depends on the charactor received: ( Note that the RGB LED is Low active)

void ProcessSms( String sms )
  Serial.print( "ProcessSms for [" );
  Serial.print( sms );
  Serial.println( "]" ); 
  if( sms.indexOf("onr") >= 0 ){  //If “onr“ receoved
    digitalWrite(LED_R, LOW); // Turn On the Red Color
    Serial.println( "LED Red ON" );
  if( sms.indexOf("ong") >= 0 ){
    digitalWrite( LED_G, LOW);// Turn Off the Green Color
    Serial.println( "LED Green ON" );
    if( sms.indexOf("onb") >= 0 ){
    digitalWrite(LED_B, LOW);
    Serial.println( "LED Blue ON" );//Turn On the Blue Color
    if( sms.indexOf("offr") >= 0 ){
        digitalWrite( LED_R,HIGH);//Turn Off the Red Color
    Serial.println( "LED Red OFF" );
  if( sms.indexOf("offg") >= 0 ){
    digitalWrite(LED_G, HIGH ); //Turn Off the Green Color
    Serial.println( "LED Green OFF" );
    if( sms.indexOf("offb") >= 0 ){
    digitalWrite(LED_B, HIGH ); //Turn Off the Blue Color
    Serial.println( "LED Blue OFF" );

Select the right port and Arduino board: Arduino pro mini 3.3V 8MHz to upload the firmware to Maduino GPRS A6 boards
Maduino GPRS A6 10.JPG
5.Test Result
You can send SMS to Maduino GPRS A6 board to control the LED On/Off now. After getting the SMS, the Maduino A6 will check the SMS firstly, and then turn On/Off the related LED Color with the commands:
Maduino GPRS A6 11.JPG

GPRS Connectivity

Of course the Maduino GPRS A6 can be capable of the GPRS connectivity for Internet, to upload/download data with internet. The following simple example shows the starters how to access a website on the internet (Users need check the AT commands for how to access an website):

     sendData("GET HTTP/1.0\r\n\r\n\r\n",100,DEBUG);
     sendData("AT+CIPCLOSE ",1000,DEBUG);

If the GPRS service accessible, the Maduino board get data from the site, you can check the serial output debug info as:
Maduino GPRS A6 12.JPG
Then you can upload/download related data from the site to create remote data acquisition or remote controlling.


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