top of page

Bluetooth module HC-05

Set serial parameter.

Specifications Hardware features  Typical -80dBm sensitivity  Up to +4dBm RF transmit power  Low Power 1.8V Operation ,1.8 to 3.6V I/O  PIO control  UART interface with programmable baud rate  With integrated antenna  With edge connector


Software features  Default Baud rate: 38400, Data bits:8, Stop bit:1,Parity:No parity, Data control: has. Supported baud rate: 9600,19200,38400,57600,115200,230400,460800.  Given a rising pulse in PIO0, device will be disconnected.  Status instruction port PIO1: low-disconnected, high-connected;  PIO10 and PIO11 can be connected to red and blue led separately. When master and slave are paired, red and blue led blinks 1time/2s in interval, while disconnected only blue led blinks 2times/s.  Auto-connect to the last device on power as default.  Permit pairing device to connect as default.  Auto-pairing PINCODE:”0000” as default  Auto-reconnect in 30 min when disconnected as a result of beyond the range of connection.


AT command Default:

How to set the mode to server (master): 1. Connect PIO11 to high level. 2. Power on, module into command state. 3. Using baud rate 38400, sent the “AT+ROLE=1\r\n” to module, with “OK\r\n” means setting successes. 4. Connect the PIO11 to low level, repower the module, the module work as server (master). AT commands: (all end with \r\n) 1. Test command: Command Respond Parameter AT OK - 2. Reset Command Respond Parameter AT+RESET OK - 3. Get firmware version Command Respond Parameter AT+VERSION? +VERSION:<Param> OK Param : firmware version Example: AT+VERSION?\r\n +VERSION:2.0-20100601 OK 4. Restore default Command Respond Parameter AT+ORGL OK - Default state: Slave mode, pin code :1234, device name: H-C-2010-06-01 ,Baud 38400bits/s. 5. Get module address Command Respond Parameter AT+ADDR? +ADDR:<Param> OK Param: address of Bluetooth module Bluetooth address: NAP: UAP : LAP Example: AT+ADDR?\r\n +ADDR:1234:56:abcdef OK 6. Set/Check module name: Command Respond Parameter AT+NAME=<Param> OK Param: Bluetooth module name (Default :HC-05) AT+NAME? +NAME:<Param> OK (/FAIL) Example: AT+NAME=HC-05\r\n set the module name to “HC-05” OK AT+NAME=ITeadStudio\r\n OK AT+NAME?\r\n +NAME: ITeadStudio OK 7. Get the Bluetooth device name: Command Respond Parameter AT+RNAME?<Param1> 1. +NAME:<Param2> OK 2. FAIL Param1,Param 2 : the address of Bluetooth device Example: (Device address 00:02:72:od:22:24,name:ITead) AT+RNAME? 0002,72,od2224\r\n +RNAME:ITead OK 8. Set/Check module mode: Command Respond Parameter AT+ROLE=<Param> OK Param: 0- Slave AT+ ROLE? +ROLE:<Param> OK 1-Master 2-Slave-Loop 9. Set/Check device class Command Respond Parameter AT+CLASS=<Param> OK Param: Device Class AT+ CLASS? 1. +CLASS:<Param> OK 2. FAIL 10. Set/Check GIAC (General Inquire Access Code) Command Respond Parameter AT+IAC=<Param> 1.OK 2. FAIL Param: GIAC (Default : 9e8b33) AT+IAC +IAC:<Param> OK Example: AT+IAC=9e8b3f\r\n OK AT+IAC?\r\n +IAC: 9e8b3f OK 11. Set/Check -- Query access patterns Command Respond Parameter AT+INQM=<Param>,<Param2>, <Param3> 1.OK 2. FAIL Param: 0——inquiry_mode_standard 1——inquiry_mode_rssi Param2: Maximum number of Bluetooth devices to respond to Param3: Timeout (1-48 : 1.28s to 61.44s) AT+ INQM? +INQM:<Param>,<Param2>, <Param3> OK Example: AT+INQM=1,9,48\r\n OK AT+INQM\r\n +INQM:1, 9, 48 OK 12. Set/Check PIN code: Command Respond Parameter AT+PSWD=<Param> OK Param: PIN code (Default 1234) AT+ PSWD? + PSWD :<Param> OK 13. Set/Check serial parameter: Command Respond Parameter AT+UART=<Param>,<Param2>,<Param3> OK Param1: Baud Param2: Stop bit Param3: Parity AT+ UART? +UART=<Param>,<Param2>, <Param3> OK Example: AT+UART=115200,1,2,\r\n OK AT+UART? +UART:115200,1,2 OK 14. Set/Check connect mode: Command Respond Parameter AT+CMODE=<Param> OK Param: 0 - connect fixed address 1 - connect any address 2 - slave-Loop AT+ CMODE? + CMODE:<Param> OK 15. Set/Check fixed address: Command Respond Parameter AT+BIND=<Param> OK Param: Fixed address (Default 00:00:00:00:00:00) AT+ BIND? + BIND:<Param> OK Example: AT+BIND=1234,56,abcdef\r\n OK AT+BIND?\r\n +BIND:1234:56:abcdef OK 16. Set/Check LED I/O Command Respond Parameter AT+POLAR=<Param1,<Param2> OK Param1: 0- PIO8 low drive LED 1- PIO8 high drive LED AT+ POLAR? + POLAR=<Param1>,<Param2> OK Param2: 0- PIO9 low drive LED 1- PIO9 high drive LED 17. Set PIO output Command Respond Parameter AT+PIO=<Param1>,<Param2> OK Param1: PIO number Param2: PIO level 0- low 1- high Example: 1. PIO10 output high level AT+PI0=10,1\r\n OK 18. Set/Check – scan parameter Command Respond Parameter AT+IPSCAN=<Param1>,<Param2>,<Param3>,<Param4> OK Param1: Query time interval Param2:Query duration Param3:Paging interval Param4:Call duration AT+IPSCAN? +IPSCAN:<Param1>,<Param2>,<Param3>,<Param4> OK Example: AT+IPSCAN =1234,500,1200,250\r\n OK AT+IPSCAN? +IPSCAN:1234,500,1200,250 19. Set/Check – SHIFF parameter Command Respond Parameter AT+SNIFF=<Param1>,<Param2>,<Param3>,<Param4> OK Param1: Max time Param2: Min time Param3: Retry time Param4: Time out AT+ SNIFF? +SNIFF:<Param1>,<Param2>,<Param3>,<Param4> OK 20. Set/Check security mode Command Respond Parameter AT+SENM=<Param1>,<Param2> 1. OK 2. FAIL Param1: 0——sec_mode0+off 1——sec_mode1+non_se AT+ SENM? + SENM:<Param1>,<Param2> cure 2——sec_mode2_service 3——sec_mode3_link 4——sec_mode_unknown Param2: 0——hci_enc_mode_off 1——hci_enc_mode_pt_to_pt 2——hci_enc_mode_pt_to_pt_and_bcast 21. Delete Authenticated Device Command Respond Parameter AT+PMSAD=<Param> OK Param: Authenticated Device Address Example: AT+PMSAD =1234,56,abcdef\r\n OK 22. Delete All Authenticated Device Command Respond Parameter AT+ RMAAD OK - 23. Search Authenticated Device Command Respond Parameter AT+FSAD=<Param> 1. OK 2. FAIL Param: Device address 24. Get Authenticated Device Count Command Respond Parameter AT+ADCN? +ADCN:<Param> OK Param: Device Count 25. Most Recently Used Authenticated Device Command Respond Parameter AT+MRAD? + MRAD:<Param> OK Param: Recently Authenticated Device Address 26. Get the module working state Command Respond Parameter HC-05 Bluetooth module 06.18.2010 11 Tech Support: AT+ STATE? + STATE:<Param> OK Param: “INITIALIZED” “READY” “PAIRABLE” “PAIRED” “INQUIRING” “CONNECTING” “CONNECTED” “DISCONNECTED” “NUKNOW” 27. Initialize the SPP profile lib Command Respond Parameter AT+INIT 1. OK 2. FAIL - 28. Inquiry Bluetooth Device Command Respond Parameter AT+INQ +INQ: <Param1>, <Param2>, <Param3> …. OK Param1:Address Param2:Device Class Param3:RSSI Signal strength Example: AT+INIT\r\n OK AT+IAC=9e8b33\r\n OK AT+CLASS=0\r\n AT+INQM=1,9,48\r\n At+INQ\r\n +INQ:2:72:D2224,3E0104,FFBC +INQ:1234:56:0,1F1F,FFC1 +INQ:1234:56:0,1F1F,FFC0 +INQ:1234:56:0,1F1F,FFC1 +INQ:2:72:D2224,3F0104,FFAD +INQ:1234:56:0,1F1F,FFBE +INQ:1234:56:0,1F1F,FFC2 +INQ:1234:56:0,1F1F,FFBE +INQ:2:72:D2224,3F0104,FFBC OK 28. Cancel Inquiring Bluetooth Device Command Respond Parameter AT+ INQC OK - HC-05 Bluetooth module 06.18.2010 12 Tech Support: 29. Equipment Matching Command Respond Parameter AT+PAIR=<Param1>,<Param2> 1. OK 2. FAIL Param1:Device Address Param2:Time out 30. Connect Device Command Respond Parameter AT+LINK=<Param> 1. OK 2. FAIL Param:Device Address Example: AT+FSAD=1234,56,abcdef\r\n OK AT+LINK=1234,56,abcdef\r\n OK 31. Disconnect Command Respond Parameter AT+DISC 1. +DISC:SUCCESS OK 2. +DISC:LINK_LOSS OK 3. +DISC:NO_SLC OK 4. +DISC:TIMEOUT OK 5. +DISC:ERROR OK Param:Device Address 32. Energy-saving mode Command Respond Parameter AT+ENSNIFF=<Param> OK Param:Device Address 33. Exerts Energy-saving mode Command Respond Parameter AT+ EXSNIFF =<Param> OK Param:Device Address

257 views0 comments

Recent Posts

See All


bottom of page