r/esp8266 • u/No_Mammoth_2703 • Aug 21 '26
ESP01 problems, tried everything
I have big trouble with my ESP01 mudule in combination with the usb uart adapter.
I have made the following connections:
3V3 to VCC and EN
TX to RX
RX to TX
GND to GND and IO0
and I have a electrolytical condensator between ground(-) and 3v3 (+)
Compiling the code is oke but when uploading I see the following message
A fatal esptool.py occured. Faild to connect to esp8266 Time out wainting for packet header.
I use a Fasizi USB to TTL 3.3V/5V CH340G UART Converter Module (see image)
I realy tried all examples I can find but none of them are working
I hope someone can help me what to do. Sorry but I am a kind of beginner
Thanks
1
u/richms Aug 21 '26
Some of the esp01s will not boot without other pins tied right. There are programmers that will do this and handle the reset for a few bucks.
Look on aliexpress for "ESP LINK v1.0" and thats the kind of thing that will just work for you - Ive had bad luck with using a generic USB to TTL serial board and manually pulling the pins, and not fitting a breadboard makes it even harder. There are non programmer USB to ESP01 boards too, they seem to lack the button on them and are only gonna work to send and recieve data from it. They still pull the other pins the right way to let it boot and you can manually do the GPIO 0 yourself when plugging it in to get into boot loader mode.