• The A9G development board has basic phone/sms, GPRS network communication, and GPS/BDS dual-mode positioning.
• A9G development board contains lithium battery charge management, microphone, speaker interface, USB communication interface, multiple user buttons / led, TF card slot, SPI interface, I2C2 interface, ADC interface.
• A9G development board camera expansion board, can be connected to 30W/200W camera.
• A9G development board slot machine expansion board, can be connected to a traditional coin machine.
 
• Remote monitor intercom with GSM and microphone/speaker
• Smart watch with GPRS/GSM+GPS, 1.54-inch capacitive touch screen
• Use GPRS/GSM+GPS, heart rate blood oxygen sensor, 1.54 inch capacitive touch screen for elderly monitoring watches
• Remote surveillance camera using GPRS+TF+ camera expansion board
• WeChat payment slot machine solution using the slot machine expansion board
• Basic debugging of custom devices based on lua programming using the onboard feature:
wiring
The development board uses AT firmware. When debugging, use 4 wires to connect usb-ttl, and connect to the computer for debugging: VUSB→5V; GND→GND; AT_TX→RX; AT_RX→TX;
Or use USB power supply, and then connect three lines GND → GND; AT_TX → RX; AT_RX → TX;
Or lithium battery power supply VBAT → (3.3v-4.2) V; GND → GND; AT_TX → RX; AT_RX → TX; (using VBAT power supply, you need to press the power_key button for 2s or so)
Power-on
1. The A9G development board can be powered by a lithium battery or USB.
2. After power-on 1~2S, the module will run automatically. At this time, the serial port will automatically output information. The entire process of powering up to the development board does not require any operation.
3. To reset, press the Rst_Key button.
4. The module enters the AT command mode by default. 1. Module power-on printing information
Under normal circumstances, the module power-on initialization completion flag is +CIEV: READY, the actual module requests data from the base station during initialization, will issue the date, zero time zone time and time zone information, due to network reasons, will be in READY Then output. Of course, after the READY appears, it means that the module is powered on and initialized.
 
2. A9G baud rate adaptation
The A9G has a baud rate adaptation function and the default baud rate is 115200. In the module power-on initial process, the baud rate of the module can be modified. For example, my MCU's baud rate is 9600, then when the module is just powered up, send a command AT (not only limited to this command, just to adjust the baud rate), the module will automatically adjust the wave The rate is up to 9600.
 
Package Included:
1 Set

Package includes:

GSM/GPRS + GPS/BDS A9G Development Board Wireless Data Transmission +Positioning