Using Bluetooth UART Module - HC-06 linvorV1.8

Time to try the Bluetooth Module I bought in China. Obviously other than a mark “SJ” it had no other information so I can not search any web site for more information. Fortunately the 4Pin bergstick has the signal named VCC, GND, TXD, RXD. There are two pads in the PCB in beginning and end of the bergstick with names WAKEUP & STATE. Further in the middle of the PCB there are 3pads name PIO5, 3V3 & PIO4.

Searching in Google, revealed the below facts:

1. The module I got is slave only & uses HC-06 firmware
2. The commands supported are
1. AT responds OK
2. AT+BAUDn where n=1 ... C (1=1200, 2=2400, 3=4800, 4=9600 (default), 5=19200, 6=38400, 7=57600, 8=115200, 9=230400, A=460800, B=921600, C=1382400). Responds OKnnnn. Retained across power offs.
3. AT+NAMEname where name 20 or fewer characters. Responds OKname. Retained across power offs.
4. AT+PINnnnn sets the pairing password. Responds OKsetpin.
5. AT+Pn where n is N (no parity), O (odd parity) or E (even parity). Firmware version higher than Linvor 1.5 only.
6. AT+VERSION responds with the firmware version

Things I bought at Huaqiangbei and SEG Electronics Market, Shenzhen, China

I visited China recently on official purpose and I got one day (Sunday) to explore local electronics/computer market. There is an area called Huaqiangbei where multiple tall rise building are there selling all sorts of electronic items. Details of few things which I bought over there are given below. I am yet to try these. Will share my experience later (working or not working!!)

1. Bluetooth UART module - Cost - RMB 35

2. Ultrasonic Ranging Module HC-SR04 - Cost - RMB 10