Model:HM-10

I had it working with my Arduino in a few minutes. There seems to be contradictory advise on a voltage splitter. The ridiculously small specs book says it needs one so I did one. The iPhone app really makes using it useful. I used the app to trace the processing logic rather than the serial screen on a laptop. The laptop would have been awkward. I’m note sure about the android app. that someone else was having issues with.

A great kit, they all worked. Read about the requirements to see if it is what you need.

Update: It seems there is some disagreement among other reviews about whether this is a clone, fake, or genuine. First, I would say for sure it is not a "fake"; it behaves exactly the same as a genuine Jinan HuaMao HM-10, and the firmware is exactly the same. Whether it is a clone or genuine is up to interpretation. The breakout board is definitely NOT an original breakout board from Jinan HuaMao. I own more than 20 HM-10's ordered direct from Jinan HuaMao, so I know the difference. Based on the fact that the breakout board is different, I would say it is a clone. But others might say that the breakout board is not as important as the actual BLE board and chip. From what I can tell, the BLE board seems to be a genuine Jinan HuaMao HM-10 board. DSD Tech must have ordered a bunch of genuine boards from Jinan HuaMao (BLE boards by themselves and in bulk are cheap), then added their own breakout board. Whether you call that a clone or genuine is up to you. For me, it's a clone that uses a genuine BLE board.It's a perfect working clone of a Jinan Huamao HM-10. I swapped this one into a working project, and everything worked exactly the same. Even the UUIDs are exactly the same. I also connected using an Arduino Uno and tested some AT commands in the serial window, and everything worked exactly as it would with a Jinan Huamao HM-10.Weirdly, it's kinda rare to find a clone that is actually a 100% clone. Most clone manufacturers can't seem to do it right, or can't bring themselves to make an exact clone including UUIDs., or just can't resist fiddling with some small issue (such as changing the "AT+" command to "AT-" or whatever).I also like the little plastic box around the board. Adds no useful value at all, but it looks nice.

I used this for a car alarm project that connected to an arduino. Worked great but the app that it recommended was a bit difficult to get it to work. I used the Bluetooth for Arduino app on my iPhone and worked easily!

Just bought it to experiment with as a hobby item. I wanted to add bluetooth to an arduino board that controls relays according to timed programs. Seems to work fine.

Unit has very poor info instruction ( commonly found on products made in China).I was planning to use it with arduino board but I have not been able to make it work.

I got this device to add bluetooth capabilities to my Teensy project. Unlike Arduino schematics poster, it's very easy to connect to a Teensy. Simply connect GND to GND, VCC to 5v. Then RX and TX to a RXn and TXn (blue on the pin out sheet.) Then from your code you work with it like the USB serial connection, but instead of Serial.print() you would use Serialn.print() where n is the serial port number you wired too. Thats it!So with some basic code and you can accept Serial AT commands from your computer to relay to your bluetooth module. With an app like nrfConnect you can send commands to the module and get that back out of the Serial connected to your computer. At a very basic transport level these things work well.My problem is likely due to poor planning. I wanted to do a proximity based action where the BLE module would detect my iPhone or Apple Watch and then perform an action as I came into and out of the proximity zone. I've done this on other devices but the snag here is getting the module to see the MAC of my target devices. Turns out that from an iOS app perspective BLE is the right choice, but from a proximity or presence angle classic BT is likely the answer. So at this point I've ordered an HM-05 to test out this theory. There is literally no pairing involved, just a scan to see if a particular device is nearby or not, so it will likely bypass Apples silly bluetooth policies.Anyway, figure out if thing is right first. Otherwise you'll have it on hand for the next project like I do...

Red light on board blinks with power applied. No response from device using the DSD TECH SH-U09C USB to TTL Serial Adapter, did not respond to test command or any settings using the DSD TECH software and their test adapter. Adapter worked correctly with RX/TX shorting connector. Amazes me in this day and age where so many things are BlueTooth connected and work seamlessly, that such a simple device should not work.