This is A7, A6C, and A6 is a GSM/GPRS/GPS Module that Supports GSM, GPRS, and GPS Quad-Band 850/900/1800/1900 MHz 2G GSM network worldwide with an SMS, GPRS Class 10 Data Service, and GPS feature and supports digital audio and analog audio support for HR, FR, EFR, AMR speech coding, there is another module that comes from this series the A2 & A20.
A2/A20 is GSM/GPRS/GPS + WIFI with ESP8266/8285 Wi-Fi IC onboard, GSM / GPRS four frequency bands including 850, 900, 1800, 1900MHz and it has four working mode the GPRS mode, Wi-Fi mode, both mode, Wi-Fi control GPRS and camera mode. Use ESP8266/8285 secondary UART port that required a code to drive the ESP8266/ESP8285. The A2/A20 you can simply develop a wireless GPS tracking device or a monitoring device can be used in industrial, agricultural monitoring, outdoor monitoring, intelligent home appliance, driving test, fingerprint/face machine, and video doorbell, etc. another function of A6C and A20 is can capture a photo via GPRS or Wi-Fi switch transmission. The A7, A6C, A6, A20 module is controlled by using AT command via UART supplied by 3.3v / 4.2v logic level.
Required Components
- Arduino Microcontrollers, Teensy, ESP8266, ATMEGA328 16/12, ATMEGA32u4 16/8/ MHz, ESP8266, ATMEGA250 16 MHz, ATSAM3x8E, ATSAM21D, ATTINY8516/8 MHz (Note: The Diagram below is using NANO. If you’re using other MCU please refer to the respective pin-outs.
- USB TTL/UART
- A2 / A7 / A6C / A6 Module
- Jumper Wire / DuPont Wire
- Solder Less Bread Board
Wiring Diagram for A7 / A6C / A6
Wiring Diagram for A2 / A20
Pin-outs Definitions
AT Command Tester
Working on AT – Command please see AT-Command documentation manual or you can use the AT-Command tester which can be downloaded below.
Test Sketch Code
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#include <String.h> #define OK 1 #define NOTOK 2 #define TIMEOUT 3 #define RST 2 #define gsmboard Serial1 #ifndef gsmboard SoftwareSerial gsmboard (10, 3); #define abaudrate 9600 #else #define abaudrate 115200 #endif #define SERIALTIMEOUT 3000 char end_c[2]; void setup() { gsmboard.begin(abaudrate); // the GPRS baud rate Serial.begin(115200); // the GPRS baud rate // ctrlZ String definition end_c[0] = 0x1a; end_c[1] = '\0'; Serial.println("Start...."); pinMode(RST, OUTPUT); digitalWrite(RST, HIGH); delay(5000); digitalWrite(RST, LOW); delay(500); if (agsmbegin() != OK) { Serial.println("Error"); while (1 == 1); } } void loop() { //When startin up the code, you can use a terminal tools like puty, termcool, see the download option below, // Note: when you are in the terminal if your {t} w/o bracket you will execute the send text message command, // Note: when you type {d} w/o bracket you will execute the voice dial command. acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); Serial.println("Waiting for command"); if (Serial.available()) switch (Serial.read()) { case 't': Serial.println("Send SMS"); SendTextMessage(); break; case 'v': Serial.println("Make voice call"); DialVoiceCall(); break; case 'h': Serial.println("Not Available"); SubmitHttpRequest(); break; case 's': Serial.println("-----------------14CORE A7 A6C A20 TEST CODE ----------------------"); float batt = (float)analogRead(A0) * 5.165 / 594.0; sendSparkfunGSM(1, batt); break; } if ( gsmboard.available()) Serial.write( gsmboard.read()); delay(2000); } ///SendTextMessage() ///this function is to send a sms message void SendTextMessage() { acommand("AT+CMGF=1\r", "OK", "yy", 2000, 2); // Command to send SMS delay(100); acommand("AT+CMGS = \"+123123123\"", ">", "yy", 20000, 2); //Note: You need to add phone number delay(100); gsmboard.println("14CORE | GSM SMS TEST");//Your text message will be on this line gsmboard.println(end_c);//Control+Z in ASCII gsmboard.println(); } ///DialVoiceCall ///this function is to dial a voice call void DialVoiceCall() { acommand("AT+SNFS=0", "OK", "yy", 20000, 2); acommand("ATD+41615110889;", "OK", "yy", 20000, 2); //Command to dial a number } /* This is for HTTPREQUEST function to forward an http request note: delay is important to this function. */ void SubmitHttpRequest() { acommand("AT+CSQ", "OK", "yy", 20000, 2); acommand("AT+CGATT?", "OK", "yy", 20000, 2); acommand("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"", "OK", "yy", 20000, 2); //Command for SAPBR, the to set connection type using gprs acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+SAPBR=3,1,\"gprs.swisscom.ch\",\"\"", "OK", "yy", 20000, 2); //Command setting the APN, you need to fill in your local apn server acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+SAPBR=1,1", "OK", "yy", 20000, 2); //setting the SAPBR, for detail you can refer to the AT command mamual gsmboard.println("AT+HTTPINIT"); //Command to initialize the HTTP request delay(2000); ShowSerialData(); gsmboard.println("AT+HTTPPARA=\"URL\",\"www.google.com.hk\"");// setting the httppara, the second parameter is the website you want to access delay(1000); ShowSerialData(); gsmboard.println("AT+HTTPACTION=0");//submit the request delay(10000);//the delay is very important, the delay time is base on the return from the website, if the return datas are very large, the time required longer. //while(!mySerial.available()); ShowSerialData(); gsmboard.println("AT+HTTPREAD");// read the data from the website you access delay(300); ShowSerialData(); gsmboard.println(""); delay(100); } bool sendSparkfunGSM(byte sparkfunType, float value1) { String host = "data.sparkfun.com"; // Test to push your data in sparkfun String publicKey = "your_public_key_will_here"; String privateKey = "your_private_key_will_here"; acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CGATT?", "OK", "yy", 20000, 2); acommand("AT+CGATT=1", "OK", "yy", 20000, 2); acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CGDCONT=1,\"IP\",\"gprs.swisscom.ch\"", "OK", "yy", 20000, 2); //bring up wireless connection acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CGACT=1,1", "OK", "yy", 10000, 2); acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); // acommand("AT+CIICR", "OK", "yy", 20000, 2); //pull up wireless connection // acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CIFSR", "OK", "yy", 20000, 2); //Command to get your local IP address acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CIPSTART=\"TCP\",\"" + host + "\",80", "CONNECT OK", "yy", 25000, 2); //start up the connection // ainput(); acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CIPSEND", ">", "yy", 10000, 1); //Command start sending data to a remote server delay(500); gsmboard.print("GET /input/"); gsmboard.print(publicKey); gsmboard.print("?private_key="); gsmboard.print(privateKey); gsmboard.print("&battery="); gsmboard.print(value1, 2); gsmboard.print(" HTTP/1.1"); gsmboard.print("\r\n"); gsmboard.print("HOST: "); gsmboard.print(host); gsmboard.print("\r\n"); gsmboard.print("\r\n"); Serial.print("GET /input/"); Serial.print(publicKey); Serial.print("?private_key="); Serial.print(privateKey); Serial.print("&battery="); Serial.print(value1, 2); Serial.print(" HTTP/1.1"); Serial.print("\r\n"); Serial.print("HOST: "); Serial.print(host); Serial.print("\r\n"); Serial.print("\r\n"); acommand(end_c, "HTTP/1.1", "yy", 30000, 1); //Start send data to remote server unsigned long entry = millis(); //gsmboard.println(end_c); //sending ctrlZ acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); acommand("AT+CIPCLOSE", "OK", "yy", 15000, 1); acommand("AT+CIPSTATUS", "OK", "yy", 10000, 2); delay(100); Serial.println("Done......................"); } byte await(String response1, String response2, int timeOut) { unsigned long entry = millis(); int count = 0; String reply = agsmread(); byte retVal = 99; do { reply = agsmread(); if (reply != "") { Serial.print((millis() - entry)); Serial.print(" ms "); Serial.println(reply); } } while ((reply.indexOf(response1) + reply.indexOf(response2) == -2) && millis() - entry < timeOut ); if ((millis() - entry) >= timeOut) { retVal = TIMEOUT; } else { if (reply.indexOf(response1) + reply.indexOf(response2) > -2) retVal = OK; else retVal = NOTOK; } // Serial.print("retVal = "); // Serial.println(retVal); return retVal; } byte acommand(String command, String response1, String response2, int timeOut, int repetitions) { byte returnValue = NOTOK; byte count = 0; while (count < repetitions && returnValue != OK) { gsmboard.println(command); Serial.print("Command: "); Serial.println(command); if (await(response1, response2, timeOut) == OK) { // Serial.println("OK"); returnValue = OK; } else returnValue = NOTOK; count++; } return returnValue; } void ainput() { String thisString; char buffer[100]; while (1 == 1) { if (Serial.available()) { thisString = Serial.readStringUntil('\n'); thisString.toCharArray(buffer, thisString.length() + 1); if (thisString.indexOf("end") == 0) { gsmboard.write(end_c); Serial.println("end"); } else { gsmboard.write(buffer); gsmboard.write('\n'); } } if (gsmboard.available()) { Serial.write(gsmboard.read()); } } } bool agsmbegin() { gsmboard.println("AT+CREG?"); byte hi = await("1,", "5,", 1500); // 1: registered, home network ; 5: registered, roaming while ( hi != OK) { gsmboard.println("AT+CREG?"); hi = await("1,", "5,", 1500); } if (acommand("AT&F0", "OK", "yy", 5000, 2) == OK) { // To reset as factory settings if (acommand("ATE0", "OK", "yy", 5000, 2) == OK) { // to disable the Echo if (acommand("AT+CMEE=2", "OK", "yy", 5000, 2) == OK) return OK; // Activate better error messages else return NOTOK; } } } void ShowSerialData() { unsigned long entry = millis(); while ( gsmboard.available() != 0 && millis() - entry < SERIALTIMEOUT) Serial.println(gsmboard.readStringUntil('\n')); } String agsmread() { String reply = ""; if (gsmboard.available()) { reply = gsmboard.readString(); } // Serial.print("Reply : "); // Serial.println(reply); return reply; } |
Downloads
- GSM AT Command Error Code List | FILE
- Download AT-Command Datasheet Manual for A7 – A6 – A6C | PDF 1 | PDF 2
- Download AT-Command Datasheet Manual for A20 | PDF
- Download A7 Breakout Schematics Diagram | LINK
- Download A6C Breakout Schematics Diagram| LINK
- Download A6 Breakout Schematics Diagram | LINK
- Download A20 Breakout Schematics Diagram | PDF
- Download Serial Tools | RealTerm | Putty | CoolTerm | TeraTerm
- Download AT Command Test Tool > http://m2msupport.net/m2msupport/download-at-command-tester/
Wiring the A7 / A6 / A6C / A2 / A20 GSM GPRS / GPS WIFI Quad Band 2G GSM Module Board
Hello, can some one help me
I have A6 GPRS Module Development Board GSM.
Can I connect to the A6, a motion detector and a microphone?
The motion detector is to activate an SMS to my phone.
The microphone is for me to call the A6 and hear the sound.
It’s possible?
Thanks