Is possible burn the firmware?

[alexandre-mbm]

Sorry because this is not a project's issue. But I do not find more expert than this site.

I know that I can load sketches on ESP8266 through Arduino IDE. I also know that I can do AVR flashing using a Arduino Uno or Nano as Arduino ISP through Arduino IDE. There are specifics tutorials.

I would to know if (and how) I could do flashing of ESP8266 from an Arduino as ISP.

I'm interested in changing the FTDI converter by an Arduino Nano.

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[alexandre-mbm]

If I use TX/RX of a SparkFun's LLC, for 3.3 V, perhaps it works with SDIO, SPI or I²C. But this do not implies it have UART support, is not?

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Update

Source of the image: SparkFun’s Logic Level Converter, by Eliot at hackaday.com's blog

[mangelajo]

You could use a voltage divider on the 5V TX uart to the 3.3V RX on ESP8266, also a simple resistor in series (1k) may work, due to the contention of the latch-up protection diode inside the ESP8266 chip. (which will limit the voltage to 3.3V + Vd)

[alexandre-mbm]

Let's see if I understand. These solutions do not cause ripple because of a latch-up protection diode that there is inside the ESP8266 chip. And the speed on the UART is adaptive, right?

[devyte]

Closing per #3655 .