On Thu, 16 Jul 2020 22:05:22 +0200, R.Wieser wrote:

> Alister,
>
>> 1st result when searching for hc05 on google
>> https://components101.com/wireless/hc-05-bluetooth-module seems pretty
>> straight forward to me
>
> Absolutily !
>
> .... up until the moment you find some more of the same on other
> webpages, which mentions that the EN pin just disables the module.  No
> mentioning of a datamode there.
>
> Also, my board doesn't have that button shown there.  Should I therefore
> presume its crippeled ?  Or does it maybe work differently ?
>
> And by the way: No mentioning of signal levels for/of the EN and STATE
> pins anywhere, nor if the breakout board adds tolerance for 5v signals
> on TX and RX and perhaps the above two too.
>
> To make things worse: the wiring diagram in the "How to Use the HC-05
> Bluetooth module" chapter mentions that the TXD and RXD go to the MCU -
> which under the "HC-05 Technical Specifications" might be an Arduino -
> which is supposed to run on 5v, and directly connecting the RX pin to
> one of the Arduinos pins set to output will likely destroy the 3.3v
> module.    Either someone forgot something, or that particular module
> can handle 5v signals.
>
> Nope sirree, its not as straight forward as you think it is. :-)
>
> Regards,
> Rudy Wieser

Tx & RX are described as TTL serial
TTL is a fully detailed standard as far as signal levels go.




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