此模块属于SIM900模块 ，4频模块全球可用。

温馨提示：板子背面排针默认是不焊接的 ，需要焊接的，请联系客服。。

链接:http://pan.baidu.com/s/1eQjAOvw密码: firn 

使用说明

• 电脑调试USB--TTL即可。此模块供电为：5V-26V，要是5V电源一定要在2A以上，推荐9V的电源。插上Arduino主板后,电源必须能提供2A的电流。原因是GPRS Shield开机电流和工作最多峰值电流需要最大2A，但是USB口是无法提供如此大的电流，所以必须外接供电设备。另一路供电口排针引出3.7--4.5V供电适合锂电池供电。串口完美兼容arduino单片机。TTL串口兼容3.3和5V单片机。
• 需要USB--TTL点此链接：http://item.taobao.com/item.htm?spm=686.1000925.1000774.42.08WsTk&id=39186931935
• 保证你的SIM卡没有锁住
• GPRS Shield通信的波特率最好是19200 bps 8-N-1 (GPRS Shield默认自动配对波特率)  

参考下图

1. 提供2种天线接口，兼容各种需求情况。本产品出货已经附带天线，天线带转接线，所以兼容2个接口。

2. SIM900可以通过跳线帽设置，连接到Arduino从D0到D7的任意2个引脚，不仅仅是只能使用D0D1的硬件UART。

3. Debug拨动开关，可以设置将SIM900的DEBUG口连接到Arduino或者通过Arduino上的ATMEGA8U2/FT232连接到PC上，进行debug调试。

4. 音频和麦克风口引出。

5. SIM900的多个IO口引出，如有需要可以排针后使用杜邦线连接 - 具体引脚参考原理图和datasheet。

6. 3个状态指示灯，以及3个按钮 - 其中的power on按钮可以通过使用Arduino的引脚控制达到软件来POWER ON SIM900。

7. 3.3V和5V自动电平兼容，可以自适应3.3V或者5V的主控板，支持leaf maple和Chipkit这类3.3V的其他平台开发板。

       The GPRS Shield is based on SIM900 module from SIMCOM and compatible with Arduino and its clones. The GPRS Shield provides you a way to communicate using the GSM cell phone network. The shield allows you to achieve SMS, MMS, GPRS and Audio via UART by sending AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). The shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module(They are all 2V8 logic) present onboard.

§ Quad-Band 850 / 900/ 1800 / 1900 MHz - would work on GSM networks in all countries across the world.

§ GPRS multi-slot class 10/8

§ GPRS mobile station class B

§ Compliant to GSM phase 2/2+

§ Class 4 (2 W @ 850 / 900 MHz)

§ Class 1 (1 W @ 1800 / 1900MHz)

§ Control via AT commands - Standard Commands: GSM 07.07 & 07.05 | Enhanced Commands: SIMCOM AT Commands.

§ Short Message Service - so that you can send small amounts of data over the network (ASCII or raw hexadecimal).

§ Embedded TCP/UDP stack - allows you to upload data to a web server.

§ RTC supported.

§ Selectable serial port.

§ Speaker and Headphone jacks

§ Low power consumption - 1.5mA(sleep mode)

§ Industrial Temperature Range - -40°C to +85 °C

Specifications

§ M2M (Machine 2 Machine) Applicatoions.

§ Remote control of appliances.

§ Remote Weather station or a Wireless Sensor Network.

§ Vehicle Tracking System with a GPS module.

§ Make sure your SIM card is unlocked.

§ The product is provided as is without an insulating enclosure. Please observe ESD precautions specially in dry (low humidity) weather.

§ The factory default setting for the GPRS Shield UART is 19200 bps 8-N-1. (Can be changed using AT commands).

§ Power select - select the power supply for GPRS shield(external power or 5v of arduino)

§ Power jack - connected to external 4.8~5VDC power supply

§ Antenna interface - connected to external antenna

§ Serial port select - select either software serial port or hareware serial port to be connected to GPRS Shield

§ Hardware Serial - D0/D1 of Arduino

§ Software serial - D7/D8 of Arduino

§ Status LED - tell whether the power of SIM900 is on

§ Net light - tell the status about SIM900 linking to the net

§ UART of SIM900 - UART pins breakout of SIM900

§ Microphone - to answer the phone call

§ Speaker - to answer the phone call

§ GPIO,PWM and ADC of SIM900 - GPIO,PWM and ADC pins breakout of SIM900

§ Power key - power up and down for SIM900