user22719: I'm a programmer, more from the software side but I do have hardware working knowledge too. I've completed the Arduino Starter Kit's 15 projects, Now trying to build some things with ESP8266 and HM-10 BLE.
I was able to connect ESP8266 to my network and start a TCP server too via AT commands(using  Arduino's Serial Monitor and FTDI 232RL USB to TTL converter)
I also have a HM-10 Bluetooth Breakout+connector board (Its based on CC2541 by TI (visible on the SMD chip)) brought from here.
Using the same setup I was able to issue AT commands successfully for ESP8266. However I tried many things, different baud rates and \r\n combinations; I just couldnt get the HM-10 to acknowledge my AT commands.
Setup: link
Connections: 
Arduino +5V --> +ve input of LDO regulator --> 3.3v OUPUT to Vcc of HM-10
Common GND for LDO regulator input and output pins, FTDI 232RL and HM10

FTDI TX --> voltage divider (1k ohms --> connection output to HM 10 RX --> 1k ohms --> 1k ohms --> GND)

There is no code/sketch as of now. I'm just trying to hook up the HM-10 BLE chip. I can pair my Android phone to it but that's not the concern here. 
The concern here is I cannot configure the HM-10 using AT commands.
The HM-10 does not reply an "OK" acknowledge for my "AT" command. Nothing happens in the serial monitor after hitting enter. Just a blank screen.
Is there a way by which I can determine what baud rate to use and what combination of \r and \n?
What am I missing here?

user22719: I found out that there is no need for a voltage divider to reduce the voltage being given to RX pin of BLE from FTDI's TX since both FTDI232RL and HM-10 are 3.3V devices (from here)
I connected the TX from FTDI directly to the RX of BLE using female to female jumpers.
Used No Line Ending and 9600 as the baud rate.
Then it worked fine, I got an OK acknowledge for my AT command.

22719: <p>I'm a programmer, more from the software side but I do have hardware working knowledge too. I've completed the Arduino Starter Kit's 15 projects, Now trying to build some things with ESP8266 and HM-10 BLE.</p>

<p>I was able to connect ESP8266 to my network and start a TCP server too via AT commands(using  Arduino's Serial Monitor and FTDI 232RL USB to TTL converter)</p>

<p>I also have a HM-10 Bluetooth Breakout+connector board (Its based on CC2541 by TI (visible on the SMD chip)) brought from <a href="http://www.amazon.in/ePro-Labs-Module-Connector-Board-Bluetooth/dp/B019WEUY6O" rel="nofollow noreferrer">here</a>.</p>

<p>Using the same setup I was able to issue AT commands successfully for ESP8266. However I tried many things, different baud rates and \r\n combinations; I just couldnt get the HM-10 to acknowledge my AT commands.</p>

<p>Setup: <a href="https://i.imgur.com/JpZDkiB.jpg" rel="nofollow noreferrer">link</a></p>

<p>Connections: </p>

<pre><code>Arduino +5V --&gt; +ve input of LDO regulator --&gt; 3.3v OUPUT to Vcc of HM-10
Common GND for LDO regulator input and output pins, FTDI 232RL and HM10

FTDI TX --&gt; voltage divider (1k ohms --&gt; connection output to HM 10 RX --&gt; 1k ohms --&gt; 1k ohms --&gt; GND)
</code></pre>

<p>There is no code/sketch as of now. I'm just trying to hook up the HM-10 BLE chip. I can pair my Android phone to it but that's not the concern here. </p>

<p>The concern here is I cannot configure the HM-10 using AT commands.</p>

<p>The HM-10 does not reply an "OK" acknowledge for my "AT" command. Nothing happens in the serial monitor after hitting enter. Just a blank screen.</p>

<p>Is there a way by which I can determine what baud rate to use and what combination of \r and \n?</p>

<p>What am I missing here?</p>
 22719: <p>I found out that there is no need for a voltage divider to reduce the voltage being given to RX pin of BLE from FTDI's TX since both FTDI232RL and HM-10 are 3.3V devices (from <a href="http://arduino-er.blogspot.in/2015/12/test-hm-10-bluetooth-40-ble-module-with.html" rel="nofollow">here</a>)</p>

<p>I connected the TX from FTDI directly to the RX of BLE using female to female jumpers.</p>

<p>Used <code>No Line Ending</code> and 9600 as the baud rate.</p>

<p>Then it worked fine, I got an <code>OK</code> acknowledge for my <code>AT</code> command.</p>
