HiLetgo HC-06 RS232 4 Pin Wireless Bluetooth Serial RF Transceiver Module Bi-Directional Serial Channel Slave Mode for Arduino

Programming the HC-06 was fairly easy to do. The one thing to remember is that these are slave-only mode, so you can't use them as masters. Which is fine for most embedded projects out there. As a result, the HC-06 uses only a subset of the AT commands for programming, such as setting the name, PIN, and baud rate but not being able to get them out of the device's EEPROM.The range is typical of most Bluetooth devices out there, barring any kind of interference by structures or otherwise. Runs on 3.3V and is well-behaved from what my meter showed, as it was able to sleep with only minimal current drain on the board.I used this in an Arduino Nano project, which I later transferred to a Teensy 3.6. It was practically seamless jumping from one to the other. I used the SoftwareSerial library for UART communication. After about 15 minutes of fiddling around with it on both boards, I was able to talk to it using my smartphone and my laptop.

Easy setup with Arduino uno. Works very well for Bluetooth debugging.

Works as one would expect. Easy to set up.

Excellent build quality.Since these are HC-06 they cannot be configured as 'master'. For interacting with an Arduino (etc.) project and a smartphone (android only) these are ideal - work good, last a long time.

Both worked when I started using these but one died after a couple of days. I was using 5v digital data out of a Nano, my bad, I thought the Nanos' had 3.3 volts outputs. The other worked fine after I put a logic level controller between the Nano and the HC-06. Get some Logic level converts if your using 5v outputs like a Nano or uno.

Unfortunately this item never worked but the company went out of their way to make it right by offering a full refund of the product.

This bluetooth board is great for adding wireless connectivity to your embedded projects. It operates in slave-only mode, so something like your smartphone or computer (or a master bluetooth module) needs to initiate the connection. I had it up and running talking to my android phone within five minutes. I needed to download a free bluetooth terminal app from the google play store, but otherwise it really is plug-and-play!

Works Fine.