A9 module development board, GSM/GPRS SMS module, voice/wireless data transmission

introduction
1. Introduction to the development sector
The LA9 development board is a multifunctional development board based on the Anxinke A9G GPRS/GSM module, which can be used to verify the basic communication and peripheral functions of the A9 module.
The LA9 development board has basic telephone/SMS, GPRS network communication.
The LA9 development board is equipped with a lithium battery charging board, microphone, speaker interface, USB communication interface, multiple user buttons/LEDs, TF card slot, acceleration sensor, SPI interface, I2C2 interface, and ADC interface.
The LA9 development board is an expansion board for coin slot machines, which can be connected to traditional coin slot machines.
1. Basic debugging
wiring
The development board uses AT firmware. During debugging, use 4 cables to connect USB-TTL and connect to the computer for debugging: VUSB 5V; GND GND; AT_Tx Rx; AT_RX TX;.
Alternatively, use a USB power supply and connect three GND GND cables; AT_Tx Rx; AT_RX TX;
O Lithium battery power supply VBAT 3.3V - 4.2 ) V; GND GND; AT_Tx Rx; AT_RX TX; (Using VBAT power. You must press the power button for about 2 seconds for a long time)
Ignition switch
The A9 development board can be powered by a lithium battery or USB.
The module automatically operates after 1-2 seconds of power on, and the serial port will automatically send out a message at this time. The entire process from ignition to normal operation of the development board does not require any operation.
To reset, press the RST_KEY button.
This module defaults to AT command mode.
Print ignition information