ESP8266 Community Forum

- Mon Aug 06, 2018 6:28 am #77597 Hello,

I want to program ESP8266 (refer attached image of the module).

So I connected the module on the NodeMCU board (PFA Image).

I connected then Arduino Uno with the NodeMCU.

Tx -> Rx
Rx -> Tx
3.3 -> Vcc
GND -> GND

Tried by making GPIO0 low.

But I get the following errors when I upload through Arduino IDE (I select Arduino UNO for progamming).

warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_open failed

Is this correct or is USB to Serial Convertor Necessary.

Thank You,

Ameya

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- Sun Aug 19, 2018 4:14 am #77812 I am a newbie , but you may try to disconnect your ground while the program is trying to flash the chip. Make sure your gpio is grounded.

Try at your own risk.