ESP8266 Community Forum

Posted: **Sun Jan 08, 2017 2:20 pm**

Hi,
I'm new with ESP8266, I wanna to flash ESP-12 with nodemcu fw.
I'm on Mac OSx 10.10.5, I correctly installed CP2012 driver and esptool.py but when I launch the command

Code: Select allsudo esptool.py --baud 115200 --port /dev/tty.SLAB_USBtoUART flash_id

to test connection with ESP it returnet me this error

Code: Select allA fatal error occurred: Failed to connect to ESP8266

.
I have this CP2102

Code: Select allhttps://www.amazon.it/gp/product/B01J5CE3GU/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

and this ESP-12

Code: Select all

https://it.aliexpress.com/item/Esp8266-WiFi-series-of-model-ESP-12-ESP-12F-esp12F-esp12-authenticity-guaranteed/32639524010.html?spm=2114.13010608.0.0.aKMajr

[attached images] and this connections:

ESP12 - CP2102
VCC + CH_PD --> 3.3 V
GND + GPIO15 + GPIO0 --> GND
TXD0 --> RXD
RXD0 --> TXD

I tried also to connect GPIO2 to 3.3 V and no result.
Then I connect GPIO2 to GND, in this case the ESP-12 led was on (blu).
But in all case I have

Code: Select allA fatal error occurred: Failed to connect to ESP8266

.

P.S.: If i connect GPIO0 and GPIO2 to 3.3 V I find new wifi network called Al-Thinker

Please help me!

Posted: **Mon Jan 09, 2017 4:08 am**

You are sure about baud rate? Have you tried 9600? In mine ESP8266 from Amica, the first flash i used a 9600 (only first flash).

sudo esptool.py --baud 9600 --port /dev/tty.SLAB_USBtoUART flash_id

Posted: **Mon Jan 09, 2017 2:34 pm**

ruben_ramos wrote:You are sure about baud rate? Have you tried 9600? In mine ESP8266 from Amica, the first flash i used a 9600 (only first flash).

sudo esptool.py --baud 9600 --port /dev/tty.SLAB_USBtoUART flash_id

Yes I tried, but same result

Posted: **Wed Jan 11, 2017 2:04 pm**

No voltage on CP2102 TDX pin

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