HC-08 藍牙模組 4.0 (主從一體)

本商品為研發實驗用的模組，無法隨插即用，須經專業背景人士（如：工程師、研究生、師生）
撰寫程式、燒錄、接線等二次加工後，才具備訊號傳輸功能。
並非直接插電後可直接使用之射頻模組，非屬電信管制射頻器材，購買前請詳閱商品說明。 

HC-08 藍牙串口通信模組是新一代的基於Bluetooth Specification V4.0 BLE 藍牙協議的通訊模組。無線工作頻段為2.4GHz ISM，調製方式是GFSK。模組最大發射功率為4dBm，接收靈敏度-93dBm，空曠環境下和iphone4s 可以實現80 米超遠距離通信。
模組採用郵票孔封裝方式，可貼片焊接，模組大小26.9mm×13mm×2.2mm，很方便客戶嵌入應用系統之內。
模組採用TI 的CC2540 晶片，配置256K Byte 空間，支援AT 指令，用戶可根據需要更改角色（主、從模式）以及UART串列傳輸速率、設備名稱等參數，使用靈活。

TXD：序列埠傳送，3.3V TTL電平。
RXD：序列埠接收，3.3V TTL電平。
CTS：序列埠流控，暫不支援。
RTS：序列埠流控，暫不支援。
DC：模擬、燒錄時鐘腳。
DD：模擬、燒錄資料腳。
RST：模組重設腳，要求不小於5ms的低電平進行重設。
VCC：模組電源腳，要求直流3.3V電源，電源供應電流不小於100mA。
GND：模組公用地。
LED：模組指示燈匯出腳，高電平匯出，接LED時請串接電阻。
     連線前，
     主機未記錄從機位址時，每秒亮100ms；
     主機記錄從機位址時，每秒亮900ms；
     從機每2秒亮1秒。
     連線后，LED常亮。
KEY：匯入腳，內部下拉。此腳接高電平，用於主機清除已記錄的從機位址。
PIO：延伸功能，用於設定模組主從型態，預設內部接上拉電阻，為從機；外部接下拉電阻1K到地，為主機。
目前只支援9600bps通訊，不支援AT指令。主機、從機透傳通訊時，資料包之間要有一定的時間間隔。例如，資料包長度為500位元組，那么資料包之間的傳送時間間隔可以設定為不小於600ms。否則，可能會丟失資料。

HC-08 firmware versions

• The default baud rate is 9600.
• There must be a delay between data packets. For example, if the baud rate is 1200 baud, the packet length is 120 bytes and the transmission time delay between packets must be not less than 2000ms otherwise you may lose data. The packet transmission time delay for 38400 baud with a packet length is 120 bytes must not be less than 200ms. At 115,200 baud with a packet length of 120 bytes, the transmission time delay between data packets must be not less than 50ms).
• When the baud rate is 19200 baud or more, the number o per packet cannot be more than 120 bytes.
• The higher the baud rate, the shorter the transmission delay time required between data packets.
• The shorter the number o per packet, the shorter the required delay time (e.g. 115,200 baud with a packet length of 20 bytes, the transmission delay time between data packets is less than 20ms).

HC-08 AT commands

• AT responds OK
• AT + BAUDx responds with OKn where x is 1 - n is 1200, 2 - 2400, 3 - 4800, 4 - 9600 (default), 5 - 19200, 6 - 38400, 7 - 57600, 8 - 115200. Note: module must be reset after power-on for the new serial port baud rate to take effect.
• AT + NAMEname responds OKsetname - name is the Bluetooth device name to be set and must be 13 characters or fewer. Retained across power offs. Note: module must be reset after power-on for the new device name to take effect.

HC-08 Current Consumption

Note: absolute maximum voltage is 3V6 DC.

HC-08 Pin Definition

• Pin 1: (UART TX) serial transmit, 3.3V TTL level.
• Pin 2: (UART RX) serial receive, 3.3V TTL level.
• Pin 3: (CTS) serial flow control, not supported.
• Pin 4: (RTS) serial flow control, not supported.
• Pin 11: (RST) reset pin; take LOW for not less than 5ms.
• Pin 12: (VCC) 2-3.6VDC operating voltage (typical 3.3VDC), current not less than 100mA.
• Pin 13: (VSS) common ground.
• Pin 14: (LED_CON) input LED control pin
• Pin 16: (LED) LED output pin; ON when paired/connected, PULSING when not paired/connected.
• Pin 18: (KEY): internal pulldown resistor keeps LOW for normal operation; HIGH erase pairing/connection information; after erasure, searches for new device to pair with/connect to randomly.
• Pin 27: (VCC) 2-3.6VDC operating voltage (typical 3.3VDC), current not less than 100mA.
• Pin 28: (GND) common ground.
• Pin 29: (RXD) UART input, 3.3V TTL level
• Pin 30: (TXD) UART output, 3.3V TTL level

• HC-08 藍牙模組 4.0 (主從一體) x 1