Note, I am using the ESP8266 ADC input, and have it reading using a direct read of the analog pin through Cayenne, as well as using a virtual pin where I do a median filter and convert to volts.
Something to note - In Cayenne, you need to read from the 3rd analog channel even though the channel is A0 in the Arduino sketch.
Also note, that for the ESP-07 at least, the ADC goes full scale from 0-3.3V. Woot. I've heard the ESP-01 only goes to 1. Mine goes to 3.3...
Also just received some ESP-12F modules. Will probably wire them up on the weekend.