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1. HC 06 BT Module Adapter PIN Name PINH Pad type Description Not GND 1321 VS Ground pot 2 S 1V8 1 VDD Integrated 1 8V supply with On chip linear regulator output within VCC 1 3 3V 2 AIOO 9 Bi Directional Programmable input output AlO1 1 Bi Directional Programmable 0 input output PIOO 2 Bi Directional Programmable 3 RX EN input output line control output for LNA if fitted PIO1 2 Bi Directional Programmable 4 TX EN input output line control output for PA if fitted PIO2 2 Bi Directional Programmable 5 input output PIO3 2 Bi Directional Programmable 6 input output PIO4 2 Bi Directional Programmable 7 input output PIO5 2 Bi Directional Programmable 8 input output PIO6 2 Bi Directional Programmable CLK_REQ 9 input output PIO7 3 Bi Directional Programmable CLK OUT 0 input output PIO8 3 Bi Directional Programmable 1 input output PIO9 3 Bi Directional Programmable 2 input output PIO10 3 Bi Directional Programmable 3 input output PIO11 34 Bi Directional Programmable input output RESETB 1 CMOS 1 Input with weak intemal UART_RT 4 CMOS UART request to S output tri send active stable with low weak UART CT 3 CMOS input UART clear to send S with weak active low internal UART_RX 2 CMOS input UART Data input with weak internal UART_TX 1 CMOS UART Data output output Tri sta2. ble with weak internal SPI_MOSI 1 CMOS input Serial peripheral 7 with weak interface data internal input SPI_CSB 1 CMOS input Chip select for serial 6 with weak peripheral interface internal active low SPI_CLK 1 CMOS input Serial peripheral 9 with weak interface clock internal SPI_MISO 1 CMOS input Serial peripheral 8 with weak interface data internal Output USB 1 Bi Directional 5 USB 2 Bi Directional 0 1 8V 1 8V 1 8V PCM Bi Directional _CLK CMOS output PCM_OUT PCM IN CMOS Input PCM Bi Directional SYNC Test Condition 25RH 65 Min Typ Max Unit 1 Carrier Freq ISM Band 2 4 2 4835 MHz 2 RFO P Power 6 2 4 dBm 3 Step size of Power control 2 8 dB 5 Freq Offset Typical Carrier freq 75 75 KHz 6 Carrier Freq drift Hopping on drift rate 50uS 20 20 KHz 1 slot packet 25 25 KHz 3 slot packet 40 40 KHz 7 Average Freg Deviations Hopping off modulation 140 175 KHz Freq Deviation 115 KHz Ratio of Freg Deviation 0 8 8 Receive Sensitivity lt 0 1 BER Bit error rate 83 dBm How to make the module enters the AT command mode 1 Make sure the BT module is working under idle mode its LED will blink quickly if the module is already setup a connection with any BT hosts then the LED will light up forever 2 Set the UART device connected with the BT module to 9600bsp 1 stop bit non flow control now user can send the AT command
3. to the device take the basic AT command AT for example you can send it to the BT module and the BT module will response with OK please note there is no r n characters after the AT command You just need to send AT the HEX value is 41 54 you can not send 41 54 OD OA If everything is correct then the module will be OK for response For the KEY function when used for the old HC 05 modules the KEY pin is used to pull up high to make the module enters the AT command mode For the new HC 06 slave module it s used to make the module re search the new devices after power up and stop the device to be connected from the old BT host So the KEY pin is working as the new device search function Typical AT commands as followed 1 test communications Send AT returns OK send a second or so Return OK 2 change the Bluetooth serial port baud rate Send AT BAUD1 Returns OK1200 Send AT BAUD2 Returns OK2400 es 1200 Does 2400 Jonas 4800 dana 9600 19200 Bed 38400 T 57600 SE 115200 e 230400 Aes 460800 Be 921600 Cae 1382400 Not recommended for use in more than 115200 baud rate signal interference make the system unstable After setting more than 115 200 can not be used with a computer use the microcontroller programming on more than 115200 baud rate and re use this to send AT command set baud rate low The baud rate with AT command set the next time do not need to use the power set you can power do
4. wn to save the baud rate 3 change device name Send AT NAMEname Returns OKname Parameter name name of the current to be set that Bluetooth is the name search 20 characters or less Example Sending AT NAMEbill_gates Back OKname Then the Bluetooth name to bill_ gates Parameters can power down to save just modify one PDA terminal services can see the changes after refreshing the Bluetooth name 4 change pairing password Send AT PINxxxx Returns OKsetpin Parameters xxxx password pair to be set 4 bytes this command can be used from the machine or host Adapter from the machine or cell phone is asked to enter the pairing password pop up window then manually enter this parameter you can connect from the machine Host is in the Bluetooth module connected with the main digital camera digital camera from the machine find the camera pairs and then entered the Bluetooth module is located the main Bluetooth module can automatically connect the camera Example Sending AT PIN8888 Back OKsetpin Bluetooth passkey to 8888 when module pair factory default password is 1234
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