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I am new to the world of micro-controller programming and have only recently begun learning about the Arduino UNO and the ESP8266-12. I have been trying to get information on the circuit connections that need to be made in order to use the Arduino UNO as a programmer for the ESP8266-12. There is a lot of information on this all over the internet but a lot of it is confusing and also conflicting.

So, I am drawn up circuit diagrams. It'll be great if somebody could comment on the correctness of the circuit diagrams.UART Download Flash Boot

I am guessing that during normal functioning, the Arduino UNO is not needed and only the VCC and EN of the ESP8266 need to be connected to the power supply. Is that correct? Ofcourse, depending on the sensors, other pins could also be used.

Thanks in advance, Divyaman

share|improve this question
    
The voltage divider on the arduino RX pin isn't needed. The ESP puts out 3.3v signals on the TX pin. The arduino RX pins requires at least 3V for a high signal. Using a voltage divider will lower the voltage even more, and probably below the 3V required – Gerben Dec 4 '15 at 13:55
    
@Gerben Thanks! That was a useful point. – Divyaman Dec 4 '15 at 16:12

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