I could have sworn I wrote about these – but apparently not! Anyway… the Espresso Lite (http://www.espert.co/) is a small board based on the ESP Vroom02 module and the board concentrates on the prototyping 0.1 loving community – a good thing !! I have one of these sitting in front of me – about the only negative thing I would say is, a few extra grounds and power connections would have been nice.
So you have potential connectors for a standard FTDI (I never understand the logic of including chips to handle USB when the thing may only be programmed a couple of times) with very clearly marked buttons for flash, reset and a “user” button.
There really is not a lot to say, connectors for everything which you can fit or not as you prefer, a decent size 3v3 regulator underneath along with level conversion and various resistors, hence keeping the top of the board clean looking – and it is generally a nice board. Now, when you go off to the site, be wary – the price does not include post and that may or may not be a deal breaker depending where you live. They do provide added value in terms of a cloud service and IOS and Android Apps. You might want to check this out.. http://www.espert.co/blog/setting-up-espert-cloud-and-mobile-app – at the time of writing (2nd January) it seems they are still in the testing phase.
Kind of strange that they used surface mount components throughout – then a normal LED!!??!! See diagram below – if only everyone else did such clear graphics..