ESP8266 Community Forum

Hi
esp-1 is working great with arduino ide but esp-7 and 12 I always get :
warning: espcomm_sync failed
error: espcomm_open failed
sometimes it says " upload finished" but nothing really ever flashed to the chip.
on esp01 I have gpio0 to low , chip to 3.3 and it works good. what am I missing with 7 and 12?(and also the dev boards that come with those version like the nodemcu devkit).

gpio15 to GND ?

Hi,
I sugest you to use Nodemcu flasher until you find the correct pins connections.

- Execute the application, connect your ESP-07/12 and click "Flash" button.
- If your ESP is in flashmode, the application shows the AP MAC and STA MAC, then click "Stop" button (or it begins flashing the newest firmware) and you're ready to use arduino IDE.
- If it doesn't show any MAC values then you should review your pins connections and repeat the step (turn off and on the ESP) until it shows the MAC values.

Hope it helps you,
Ribeiro

alonewolfx2 wrote:gpio15 to GND ?

gpio15 to low - already tried...

Ribeiro Santos wrote:Hi,
I sugest you to use Nodemcu flasher until you find the correct pins connections.

- Execute the application, connect your ESP-07/12 and click "Flash" button.
- If your ESP is in flashmode, the application shows the AP MAC and STA MAC, then click "Stop" button (or it begins flashing the newest firmware) and you're ready to use arduino IDE.
- If it doesn't show any MAC values then you should review your pins connections and repeat the step (turn off and on the ESP) until it shows the MAC values.

Hope it helps you,
Ribeiro

I managed to upload nodemcu firmware with nodemcu flasher just fine but still no arduino IDE success...