ESP8266 Community Forum

- Thu Apr 15, 2021 3:44 pm #91110 https://www.instructables.com/Arduino-Nano-ATmega238PCH340G-v30-PCB-layout/

https://image.easyeda.com/histories/7d71fac2888c42ce89fbfc3d49739abd.png

But I see one major problem there. The 3.3V source is enough for programming, but not enough for WiFi operation

- Fri Apr 23, 2021 11:31 am #91180 Hem... perhaps it's stupid comment but shouldn't Arduino TX be connected to ESP8266 RX and Arduino RX to ESP8266 TX?
Form the initial post seems that TX is connected to TX and RX to RX

- Sat Apr 24, 2021 3:00 am #91186 The signal does not come from the Arduino but from the USB / RS232 converter. Therefore, TX-TX and RX-RX are correct.

- Sat Apr 24, 2021 5:50 am #91188 I believe it's the same concept. Your TX transmission from Arduino IDE must be received by the RX of the ESP8266 and viceversa. I've programmed a few ESP8266-01S with an USB converter and I crisscrossed the TX and RX signals. Of course it depends from the USB converter.
For my ESP8266-01S I've tested two USB converters. One is a compact one with an USB A connector and an 8 pins socket where the ESP8266-01S fits without wires. In this case I believe the crossing between TX and RX is done at PCB level. The other one is less compact with a mini USB connector and pin headers. This latter needs to physically cross the TX and RX with the ones of the ESP8266-01S module