Welcome to our shop! The A9G development board is a versatile development board based on the A9G GPRS/GSM + GPS/BDS module. It is designed to validate the basic communication functions and peripheral functions of the A9G module. The A9G development board includes basic phone/SMS, GPRS networking communications, and GPS/BDS dual-mode positioning capabilities. It also contains features such as lithium battery charging management, microphone and speaker interfaces, USB communication interface, multiple user keys/LEDs, TF card slot, accelerometer, I2C2 interface, and ADC interface. In addition, the A9G development board can be expanded with a camera expansion board for external 30W/200W cameras, or with a coin machine expansion board for traditional coin machines. With these features, the A9G development board can be used for various peripheral prototyping verifications, such as vehicle immobilizers using GPRS+GPS and acceleration sensors, remote monitoring intercoms using GSM and microphone/speakers, smartwatches with 1.54" capacitive touch screens using GPRS/GSM+GPS, elderly monitoring with GPRS/GSM+GPS, heart rate oximeter sensors, and 1.54-inch capacitive touch screens, remote monitoring cameras using GPRS+TF+camera extension board, and WeChat payment slot machine schemes. It can also be used to create custom devices based on Lua programming. For debugging and wiring, you can use a USB to TTL serial cable, with VUSB to 5V, GND to GND, AT_TX to RX, and AT_RX to TX. Alternatively, you can use a USB cable to power the board, with GND to GND, AT_TX to RX, and AT_RX to TX. If you prefer to use a lithium battery, you can power the board by connecting VBAT to (3.3V-4.2V), GND to GND, AT_TX to RX, and AT_RX to TX (Press power_key button for 2 seconds). To power on the A9G development board, you can use either a lithium battery or USB. The module will automatically run after 1-2 seconds of being powered on, and the serial port will output the information automatically. No further operation is required for the development board to work normally. To reset the board, simply press the Rst_Key button. The module enters AT instruction mode by default. The specifications of the A9G development board are as follows: - Type: A9G Development Board - Weight: 22g The package includes: - 1 x A9 Development Board - 1 x GSM Antenna - 1 x GPRS Antenna 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.