ESP8266 Community Forum

- Sun Jan 03, 2016 7:07 am #37768 Still no success :/
I have tried:
Serial.print("AT\r\n");
Serial.print("AT\n\r");
Serial.println("AT\r\n");
Serial.println("AT\n\r");
No respons at all

- Sun Jan 03, 2016 10:10 am #37777 Did you check your wiring ?
Do you have GPIO15 pulled-down GND and GPIO2/GPIO0/CH_PD/RES pulled-up to VCC ?

- Sun Jan 03, 2016 12:20 pm #37785 Not sure if we are talking about the same ESP8266. I think mine is ESP8266-01. So I don't have any GPIO15.

My ESP8266:


By pulled-up, do you mean that GPIO02 and GPIO00 also need to be connected to 3.3v?

- Sun Jan 03, 2016 12:27 pm #37786 Of course, the ESP-01 doesn't expose GPIO15, it is already connected to GND, but all other modules have it exposed.
For GPIO2 and GPIO0, yes they need to be connected to VCC thru pullup resistors (something like 4K7 or 10K) to boot in normal execute mode, and GPIO0 need to be temporarily connected to GND if you wish to switch it to UpLoad mode.