I'd say there's enough info to get you going - at least for HW.
Perhaps you didn't do sufficient research before you  bought?

Good luck
Jim
On 2020-07-15, R.Wieser  wrote:
>
> Thanks for the link.  But look at that pin  description table.   It
> doesn't actually *say* anything.
>
> "STATE" "Mode the device is in"
>
> - What "mode" are they talking about ?
> - Which pin of the HC-05 module is it connected to ?  (presuming it is)
> - Is it a direct connection or does the break-out board have any components
> (resistor, diode, etc) in it.  If the latter, for what purpose (what is its
> effect).
> - In the case its /not/ a direct connection : Which "high" voltage does it
> output ?
>
> "EN" "Disables module when LOW"
>
> - Which pin of the HC-05 module is it connected to ?  (presuming it is)
> - Is it a direct connection or does the break-out board have any components
> (resistor, diode, etc) in it. If the latter, for what purpose (what is its
> effect).
> - In the case its /not/ a direct connection : Which "high" voltage does it
> accept (min and max) ?
>
> You know, the basic stuff.
>
> Really, just mentioning where the STATE and EN pins are connected to on the
> HC-05 module would be, to me, way more helpfull.
>
> Furthermore:
> - if a low disables the module, how to I enter the "command" mode (so I can
> configure it), as my module doesn't have a pushbutton.  ... or did I buy an
> intentionally crippled one ?    That would be a bit hard to swallow.
>
>> The photo shows RX/TX at 3.3V logic levels
>
> You mean by way of the silk-screen text ?   Yeah, I noticed.
>
>> Even it has a safety resistor putting another one will very
>> probalby be ok - and safe!
>
> Don't be too sure about that: back-current thru such a resistor and the
> clamping diodes is known to be problematic (I probably followed the same
> thread you mentioned :-) )
>
>> Or buy a little dual 3.3V  5V level shifter to use between
>> the device and the MCU
>
> Yeah, I know I can do that.  Together with another 3.3v voltage regulator
> (and supporting components) ofcourse.  But thats sheer insanity.
>
> Bottom line: A breakout board which makes it impossible to feed the HC-05
> from a 3.3v source (presumably due to a voltage drop in the power
> regulator), but which also doesn't seem to have anything for the signal
> lines to make it easy to use the HC-05 module on a higher voltage.   Its
> almost as if its some kind of intricate joke.
>
> Regards,
> Rudy Wieser
>
>

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