ESP8266 Community Forum

- Tue Oct 13, 2015 1:34 am #31208 That seems like a great resource. I believe by flash button (s)he is referring to the reset pin being pulled high before programming. Gonna try this out and post back if it works.

- Tue Oct 13, 2015 2:06 am #31212 no, it is more likely GPIO0 pulled low during reset.
maybe a new handling of handshake pins in OS-X disturbed the timing...

- Tue Oct 13, 2015 11:16 am #31245 hi all,

I have the same error:
espcomm_send_command: sending command header
espcomm_send_command: sending command payload
warning: espcomm_sync failed
error: espcomm_open failed

and my set-up is a bit different:
Mac Yosemite 10.10.5
Arduino IDE 1.6.5
http://arduino.esp8266.com/stable/packa ... index.json
Olimex ESP8266-DEV
FTDI232

any ideas?

- Wed Oct 14, 2015 12:50 pm #31342 I found a temporary workaround for me. Instead of the standard Arduino esptool I downloaded the python tool esptool.py from git hub. https://github.com/themadinventor/espto ... esptool.py
With this I can manually upload the sketch.
My setup:
OS X El Capitan
China Prolific 2303 USB serial adapter
Special 3th party 2303 USB driver from https://www.mac-usb-serial.com

Hope that helps