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    Seeed BLE Shield v1 This Seeed BLE Shield utilizes an HM-11 module to provide your Arduino/Seeeduino with serial BLE function. It only takes two pins of the micro controller to communicate your device with this shield. With support for a BLE ComAssistant APK, this BLE Shield can talk to your mobile phone more easily without pairing. You can use it in many conditions, like robot controls or remote control equipment ,etc. We prepared an easy and convenient command set for this shield so that you can use neat and concise code to run the function.   Specifications Specifications  Value  BT Version  Bluetooth Specification V4.0 BLE  Working Frequency  2.4GHz ISM band  Working Current  D1, BLE_RX-->D0. Then open a Serial Port Tool, like CoolTerm or others.The following are some settings : Baudrate: 9600(default) , Data Bits: 8, Parity: none, Stop Bits: 1. First, you can send a(some) "AT" command(s) to BLE Shield to have a test. If it returns an "OK", then you can do the following steps. If not, you can upload a blank program to Arduino/Seeeduino, and see whether you can get response from Serial Port Tool via the previous operation. 1void setup() 2{ 3} 4 5void loop() 6{ 7} Then, send an "AT+ROLE0" command to BLE Shield; it will return an "OK+Set:0", which means now the BLE Shield is ready to act as a slave. AT Commands More information about the AT Commands please refer to the data sheet of BLE module. You can download it from the Resource space. Related Reading  FAQ about Seeed BLE Shield. _Also, you can enter the FAQ page by clicking the "FAQ" button which in the right side of product's wiki page. _ Resource Schematic of Seeed BLE Shield BLE_apk_for_Android DataSheet of BLE module Support Please submit any technical issue into our forum or drop mail to techsupport@seeed.cc   http://wiki.seeedstudio.com/Seeed_BLE_Sheld/5‐24‐1