Very nice. That represents a level of skill I can only aspire to!
In the end I managed to find a single component that did the level conversion and 12V conversion on a single board
I don’t think that that does level conversion, only runs from 12V. Fortunately, the ESP8266 is actually quite forgiving as far as tolerating 5V levels goes, so you should be ok!
I believe it does do level conversation based on para 6 .
6. Built-in 5V to 3.3V TTL level converter to prevent high-pressure Arduino TTL level of the WiFi module damage.
Also, it’s intended to be used with an Arduino which I believe is 5V?
For the benefit of others who want to do something similar I’ve written up my investigation: Connecting Texecom Premier Using Esp8266 | The Scrapheap Architect
I see that they claim that, but I don’t see any circuitry actually DOING that level conversion. Looking at the traces on the board going from the headers to the module in the middle, there are no signs of any level conversion components.
Anyway, it’s a moot point, the module itself should be ok with it, so they can claim it if they want to!
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Sorry to bump and old thread, but what’s the latest theory on best way to interface with Texecom in 2024? I have a Pi zero 2w (running ser2net) and a level converter but super overkill for what I need. I only really want to enable Creston protocol from wintex so I can view my sensors in apple HomeKit so I can automate arming as I leave etc. Whilst the pi does this (and works well) the updates heat generated im looking for a better offering. Any tips?