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I dunno about the ESP8266 being a Arduino killer- it doesn't handle analog very well last I checked.

But as for details over what happened, check this [1]hackaday article.

[1]http://hackaday.com/2015/02/25/arduino-v-arduino/

It has one analog pin, it seems to be very limited, I agree. But you can get an ADC breakout and talk to it via SPI.

But I can buy an ADC that communicates over SPI for like 3 bucks. Then I have two chips, but then also I have a total of like 10 dollars worth of electronics, which is far more capable than a 25 dollar arduino.

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