On Fri, 17 Jul 2020 18:37:09 +0200, R.Wieser wrote:

> TNP,
>
>> FWIW there is somewhere the original TTL spec where 0 is less than some
>> voltage and 1 is more than some voltage with in between being 'here be
>> dragons'
>>
>> "A TTL input signal is defined as "low" when between 0 V and 0.8 V with
>> respect to the ground terminal, and "high" when between 2 V and VCC (5
>> V)"
>
> As you said, the origional TTL spec - for the classic 74xx series.
>
> And thats just how the those chips interpreted /incoming/ signals.
> /Outgoing/ signals where ofcourse safely quite below and above it.    A
> logic "high" for them is defined as /at minimum/ 2.4v (under heavy
> load), with no upper limit.
>
> The problem is the HC-05 module /doesn't/ run on 5v - ever.  Its also a
> CMOS device.  Both of which Alister seems to have overlooked.
>
> Regards,
> Rudy Wieser

I have over looked nothing, simply did a quick search on the device &
found more than enough information to understand the device
you seem to be up to your usual trick of either completely failing to
understand or deliberately trying to complicate the situation.



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