On Tue, 14 Jul 2020 19:27:08 +0200, R.Wieser wrote:

> Hello all,
>
> I've bought myself a HC-05 module on a JY-MCU breakout board, but cannot
> seem to find anything concrete about what the JY-MCU breakout board
> (stamped ZS-040) does or needs.
>
> The pinning:
>
> STATE (out)
> RXD \ 3.3v TXD  /
> GND \ 3.6 ... 6v VCC /
> EN (in)
>
> Biggest problem: The voltages (in and out) of the EN and STATE pins.
> Are they 5v tolerant or is 3.3v the maximum for either (signal voltage
> or pull-up).   And are the RXD and TXD pins 5v tolerant ?
>
> Secondary problem: What is the EN pin connected to on the HC-05 module ?
> What is it supposed to do ?
>
> And some confusion: Why does the JY-MCU board have a voltage regulator
> at all ? Now it can't connect to a pure 3.3v MCU, and when used with a
> 5v MCU it needs logic-level conversion buffers for the communication.
> That doesn't makee much sense ...
>
> Regards,
> Rudy Wieser

1st result when searching for hc05 on google
https://components101.com/wireless/hc-05-bluetooth-module
seems pretty straight forward to me




--
I know on which side my bread is buttered.
  -- John Heywood

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