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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