ESP8266 Community Forum

- Mon Jan 04, 2016 4:27 am #37870 As he is able to talk to his ESP-01 via terminal window I don't think that pullups are his wiring problem.

BUT I think he maybe has connected the ESP parallel to the UNOs Tx/Rx pins what won't work. The USB<>serial interface on the UNO can't connect to ATMega and ESP in parallel.

If he wants to use the ESP as WiFi module on the UNO AND see the UNO<-->ESP conversation in the terminal window, he has to connect the ESP via software serial to the UNO and adapt his sketch.

- Fri Jan 08, 2016 3:00 pm #38225 It's solved! But I'm very confused or stupid...

The pull-up didn't make any difference. But I noticed another thing, and this is where I get lost...
When I wrote this post the Arduino and ESP were connected like this:
TX<>TX
RS<>RS
As I said I was able to speak with it through Serial Monitor but it didn't respond to any sketches. Then I reverse it like this:
TX<>RS
RS<>TX
With this setup, I can't write with it in Serial Monitor but it does respond to sketches. I can see what the sketch writes in the Serial Monitor but I can't see the response from the ESP. But since "if(Serial.find("#")){}" works I take that as it works.

- Fri Jan 08, 2016 5:19 pm #38240 In one wiring mode, your ESP is talking to USB-Serial chip, in the other wiring mode the ESP is talking to Arduino MCU.

- Tue Oct 11, 2016 1:26 pm #56383 You guys are brilliant. I though I had a faulty UNO. Thanks a million guys for the RX TX swap tip.