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Uni-T UT61E bluetooth modification
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Steps:
I am going to add bluetooth module to Uni-T UT61E to connect it to PC to virtual RS-232.
I guess to install HM-10 bluetooth module due to low consumption, it is possible to supplay it from internal battery and it can be located internally (I am not sure does it have SPP and does it have to have it). Others need additional battery. Is it good idea?
So, we do not need optical isolation with bluetooth module due to we will have bluetooth isolation. Can anybody say is it possible to connect bluetooth module to RX by other way like it described in  http://blog.avrnoob.com/2014/03/uni-t-ut61e-rs232-serial-interface.html  by Anton Veretenenko?
Please point the place on the ut61e diagram where in is possible to get RX signal to HM-10 bluetooth module. Or we need transistor invertor due to UT61E sends inverted serial signal to its IR led?
Steps:
I have an idea to connect BT module to pin 123 directly (see attached picture, point A) thru inverter (part of diagram - pic.2) with n-channel mosfet 2N7000.
Is it right?
michaeliv:

--- Quote from: Steps on February 24, 2016, 06:50:17 am ---I have an idea to connect BT module to pin 123 directly (see attached picture, point A) thru inverter (part of diagram - pic.2) with n-channel mosfet 2N7000.
Is it right?

--- End quote ---
Hi, I'm not very experienced with bluetooth modules so take this as something for you to investigate rather than a definitive answer.
It's not very clear what you're schematic would look like, maybe try to draw it instead of describing it.
You need a microcontroller in between the UNI-T and the bluetooth module. Even though they're both RS232 it doesn't mean that you can just hook them up together. You need a micro that would take in the raw RS232 output of the UNI-T and wrap it in commands that the bluetooth module would understand.
Basically the bluetooth module can't make any sense of the UNI-T's output.
See here for a tutorial on what the bluetooth module is expecting : youtube.com/watch?v=UNETjvmmQx4
Add a micro that would convert the UNI-T output into the compatible output.
leon010203:
Made by this instruction. Everything works, but windows 10 does not see the com port of this module
wasyoungonce:
I think its MS not handling Btstack com port values or non common name values in registry.  Been doing this same problem since XP on BT RS232 wireless control of telescope stuff I did.

https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware-winpc/bluetooth-stack-inserts-invalid-com-port-names/ff68fac4-62b0-4b3a-b83a-0c8b1712adf8

You can edit the registry to fix it but have to do it it each boot.  You can write batch or handler files to auto fix.  Others greater than me did this for me.
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