I want to program my esp01 by using arduino uno for a transfer modul. But as long as i programmed and transfer it, i face a problem "A fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header".
The way i wired on my project is:
TX arduino to TX esp01
RX arduino to RX esp01
GND arduino to GND esp01
3v3 arduino to 3v3 esp01
GPIO esp01 to GND (i watched some articles that show different used of this. an articles show that this connection must wired when uploading process run. another article say that i have to connect it when i just plug the usb cable and must unwired it after 3-5 seconds). i try two of these way but still error.
and an optional wiring
GND arduino to button to RST esp01
i use board Gneric esp8266 module with default option. but still face an error. please tell me what should i do.
Thanks
Please add a voltage divider on the ESP-01 RX line. The pins are not 5v tolerant.
i use Arduino RX -> 1K -> ESP RX -> 1k -> 1K -> GND, which drops the 5v logic level down to 3.33v which is fine.
Otherwise you will probably damage the ESP-01 at some point.
The truth is that GPIO 0 must be pulled LOW when the ESP-01 powers up for the proper boot mode to be selected. (and in fact GPIO 2 and even GPIO 1 shouldn't be pulled LOW for that) Whatever happens with it afterwards doesn't matter. Easiest is to just have connected to GND until you have successfully uploaded.
Well first of all tell us which Arduino you are using, because it does matter a bit. If it's an UNO, it's fine, but smaller boards may not be able to provide enough current from their 3.3v pin.
Also the ESP-01 CH_PD must be connected to 3.3v / Vcc
Then you have to make sure that the Arduino does not communicate through it's Serial port while you are trying to upload. Uploading an empty sketch to it or 'Blink' will make sure of that.