ESP8266 Community Forum

- Sun May 17, 2015 5:07 am #17630 I took the ESP board out of the breakout board, and connected GPIO0, GPIO2 et GPIO15 to GND, no luck either.

I did not get the flashing green light on the board during the process though.

I only get the flashing green light when I connect GPIO0 to GND and when I start uploading on the IDE , seems like they are unable to understand each other.

- Sun May 17, 2015 5:14 am #17632 Did you pull GPIO0 AND GPIO15 to ground?

- Sun May 17, 2015 6:23 am #17640 GPIO0, GPIO2 and GPIO15 were all connected to ground. Still no go.

- Sun May 17, 2015 10:29 am #17661

GPIO0, GPIO2 and GPIO15 were all connected to ground. Still no go.

No, to load your code from uart into flash, on the gpio's you need exactly this:
GPIO15 = Low
GPIO0 = Low
GPIO2 = High (floating usually works too)
(Others have said this in "bits and pieces", I am just restating it here in full).

If you are not understanding that from the olimex docs, try reading it from this https://github.com/esp8266/esp8266-wiki/wiki/Boot-Process

But I imagine you have tried all eight combinations anyway
And that is probably not the original/root problem since it did flash before.