Cant connect the HM-10 bluetooth to Arduino Uno

Question

I have tried everything, really, everything. The HM-10 module(bluetooth), has its led and its blinks, than if you connect to it from their app, the led stop blinking and you get the UUID on the iDevice.

Problem starts when you try to program the module from its UART and send "AT" to get "OK" , from the arduino serial monitor(on mac ) .

So, i was trying to connect its tx/rx via ttl converter to the arduino uno and send commands from the monitor, didn't work.

than i was trying to connect it directly and used this link : How to use BLE Shield based on HM-10 bluetooth module?

didn't work(no respond for "AT" ) .

I have also tried this : http://www.seeedstudio.com/wiki/Bluetooth_V4.0_HM-11_BLE_Module

and this: http://www.instructables.com/id/Control-RGB-lights-from-Android-with-Arduino-Bluet/step1/Assemble-test-configure-your-Bluetooth-LE-module/

With no respond .i dont get any respond from the module (module rx goes to tx on arduino )

I dont really know whats the deal with this module, maybe its broken ( if so, how can i connect to it from my iPad and get its UUID ?? ) .

Is there anything else i can do ?? is there an option that i have put it in some mode that it can't respond anymore ?

Answer 1

The Baud rates / parameters correspondences are not the same with BLE-CC41-A or true HM-10, it's well mentioned in the Doc for the BLE-CC41-A referred in the second answer. There are some other differences.

Answer 2

There is an app for iOS that makes using the HM-10 easy to use. It is for a single pin output. There is also a link the sketch for it. I used it with Arduino Nano, HM-10, a Relay, junction box, and an outlet to turn my room light off at night without getting out of my bed. The app is FatBeard HM10 here https://itunes.apple.com/us/app/fatbeard-hm10/id1198432512?mt=8

Answer 3

if you don't know exactly what is your BT (HM-10 or CC41-A) maybe you can try this one..

https://rydepier.wordpress.com/2015/10/22/comparing-the-hm10-and-ble-cc41a-bluetooth/

I bought one HM-10 but what i got is CC41-A I turn my BT as a master, and don't forget to use NEWLINE or BOTH NR & CL neither NO LINE ENDING

Answer 4

In the Arduino serial monitor, did you remember to turn off the "Carriage Return" option? The HM-1X expects "AT" not, "AT\r"

Answer 5

I discovered my device is : BLE-CC41-A, a HM-10 rip off

The commands overlap a bit, but are different, a good command to help you out is:

AT+HELP/CR/LF

Doc for the BLE-CC41-A: http://img.banggood.com/file/products/20150104013200BLE-CC41-A_AT%20Command.pdf

Answer 6

Well, I'm playing myself with an fake HM-10 (CC41-A) since a few days. I figured out that the baud in the datasheet didn't fit. So I recompiled my Arduino sketch several times to test all BAUD rates and finally I found a rate where it startet answering to AT-commands, again.

I's suggest you should do the same. Check all baud rates on your CC41-A connection until you get en OK to an AT.

Mine required 'Both NL & CR' on the Arduino SerialMonitors settings if I enter commands manuall, as well as an <mySerial>.println("AT"); instead of <mySerial>.print("AT");!

Answer 7

Make sure you've set the same baud rate in both Arduino sketch (Serial.begin(115200)) and in HM-10 module settings(AT+BAUD4). You can use https://github.com/4ntoine/mega-to-hm10 example. A part of Apploader app that allow to upload arduino sketches from iOS devices to Arduino: http://www.apploader.info