GSM A6 FULL DEVELOPMENT BOARD WITH LCD & KEYPAD
From the makers of ESP8266
The full DEMO kit of A6 GSM has an onboard CH340 IC for serial to USB functionality .A keyboard , an LCD , relay & buzzer are also provided.
An MCU of STC 8051 family is onboard which is factory preloaded with demo code.
A 6way DIP switch seen near the MCU decides the connection between USB -
DIP switch description
MCU_MAIN_RXD 51 microcontroller serial download RXD
MCU_MAIN_TXD 51 microcontroller serial port TXD download
MCU_AT_RXD 51 microcontroller module RXD connection A6
MCU_AT_TXD 51 microcontroller module TXD connection A6
TXD UART_TXD A6 module
RXD UART_RXD A6 module
Insert a valid SIM to the back of A6 module & plug it on to the development board.
Set the DIP switch 1,3,5 & 6 to ON position.
Connect the USB cable from A6 board to PC.The CH340 driver to be installed in PC & in device manager note the COM port alotted.
Provide a 5v 2Amp adapter to the power socket.
Open the serial monitor like PuTty , provide the COM port number & set the Baud Rate to 115200.
Switch on the power.
The boot process takes 5 to 10 secs & finally you get CREG 1
After this the on board MCU will try to connect to AI THINKER cloud.This is a factory loaded demo program.Exact details are not provided by the company.
Wait till this process ends & then type AT .
The A6 module will respond with OK.
To dial a number use ATD followed by number to be called. A semicolon is not needed at the end as in SIM900.
To send a message
AT+CMFG=1 to set Text mode
Now you get a > symbol.
Type in the message to be sent & press CTRL+Z to send the message.
The phone no. can be dialled from the on board keypad & then press the DIAL button on the top.
To delete number or to provide backspace long press the dial key.
To send a preloaded test message press the Send SMS button seen next to Dial.
Now set the DIP switch position 2 & 4 to ON.
Use the TERMINAL software as it has SET MACROs facility to append 0D (carriage Return) after the AT commands.
Watch the video at bottom for full demo.
Dimensions 22.8 × 16.8 × 2.5mm; Operating temperature -
Operating Voltage 3.3V-
Standby average current 3ma less;
support the GSM / GPRS four bands, including 850,900,1800,1900MHZ;
GPRS Class 10; Sensitivity <-
support SMS text messaging;
Support GPRS data traffic, the maximum data rate, download 85.6Kbps, upload 42.8Kbps;
Supports standard GSM07.07,07.05 AT commands and extended commands Ai Thinker;
supports two serial ports, a serial port to download an AT command port;
AT command supports the standard AT and TCP / IP command interface;
support digital audio and analog audio support for HR, FR, EFR, AMR speech coding;
Pin Number Pin Name Explanation
1 to 7 NC Reserved
8 PWR_KEY Power button, 1.9V More than 2s To boot
9 GPIO1 / INT Module for controlling whether to enter a low-
Note that in this mode can not use the serial port
10 UART_CTS / GPIO5 AT Serial ports CTS
11 UART_RTS / GPIO7 AT Serial ports RTS
12 RST Module Hardware RESET Feet, when using this pin low 0.05V, Current 70ma about, Recommended NMOS to control
14 SIM_RST SIM card RST
15 SIM_CLK SIM card CLK
16 VSIM SIM Foot Power
17 SIM_DATA SIM Data
20 MIC + MIC positive electrode
21 MIC2_P headset MIC interface
22 GND t
23 EAR_L Headphone left channel
24 EAR_R Headphone right channel
26 REC + Speaker positive
29 VDD_1V8_OUT foreign 1.8V Foot Power
30 UART_TXD AT Serial ports TXD
31 UART_RXD AT Serial ports RXD
32 HST_RXD Download Serial RXD
33 HST_TXD Download Serial TXD
35 GSM_RF Foot antenna, the antenna can be connected, if connected PCB On line, Note PCB On using 50 Ohm trace
37 NC Reserved
38 NC Reserved
41 VBAT Then external power supply pin 3.3V-
AT COMMANDS PDF
VIDEO DEMO :