REES52 Bluetooth Transceiver Module with TTL Outputs HC05 (Green)

still have it and working very well

Good Things:.... Nothing Good really But;- Was easy to use once you get familiar....- No pins were bent surprisingly...Bad Things-No DatasheetNo PinOut DiagramVery Bad PackagingNo information given by seller on how to enter Command Mode (FOR AT COMMANDS)No manual or anything provided by Cloudtail.But I will solve some of your problems of entering the command mode, changing roles like slave or master changing name and password of the Bluetooth receiver, etc. Please ask the question at the product page. As review won't be at top for everyone to see.For Pin Diagram;Many reviews might suggest connecting TX of arduino to RX of module directly, which is not good for the module and may damage it.Proper pinOuts:4 Pins are used in communication mode (You can call it normal mode)>Pin 3.6 to 6 V Of Module to 5 V of Arduino>Gnd of module to Gnd of Arduino>>RX of module to TX of Arduino (Make a voltage divider to get 3.3 Volt from 5v of arduino's TX Pin. I hope you know how to do this...)>>TX of module to RX of arduino (NO need for voltage divider here as arduino can identify module's 3.3 volts as HIGH)WHILE UPLOADING SKETCH REMOVE TX AND RX CABLES.For more information, you can ask question in the product page.... Because even if I tell everything here, my review won't be shown to all people buying the product so it's better to ask in "Ask Question" section.

REES52 Bluetooth Transceiver Module with TTL Outputs HC05 This worked like charm. Initially, I was little frustrated as I was able to connect it with Arduino and pair it with my Mobile but not able to send data. Later I realized that I was making mistake because of incorrect baud rate settings in my code. It works best with baud rate of 9600.

Working Well And Good.. But I am Tried Lots of Way to Change Command Mode From Coding (Arduino Coding).But There is Only Way to Enter Command Mode is Button On The Bluetooth Device,Hold The Button On This Device and Release Immediately When Power ON.. Thats All Now You Can Access All AT Commands From Arduino Serial Monitor !

Pros:- Recieved in good packing. Looks same as given in image.- Working fine with my arduino uno3.- Password was 0000- Tested with 3 different Android phone. Worked fine.- Fast led blinking while searching for connection.- Connection speed is good.Cons:- It is very costly. I have purchased exactly same in my local market at price ₹350.- It's MRP is ₹375 in my local market but on flipkart they are showing MRP ₹740.- Wrong MRP information is the only reason to give the low rating

Working perfectly, see my home automation project using HC-05 in the attached picture .

Overall it is good and it's working fine but price should be somewhat less when I showed this to my friend he said that he has brought in 170rs so I thought money is little more but still you can buy it..

I ordered two modules. One of them does not even look the same as other and does not respond to any AT commands at all. Neither connects with my mobile bluetooth. It's a faulty piece. Don't buy it.