ESP8266 Community Forum

Posted: **Sat May 02, 2020 4:56 am**

Hello,

I got kinda weird problem with Arduino and ESP8266 module.
I connected pins like this:

ESP TX -> Arduino 8
ESP RX -> Potentiometer (divide Arduino's 5V to 3.3V -> Arduino 7)
ESP GND -> Arduino GND -> Bench PS GND
EPS 3.3 -> Bench PS 3.3
EPS EN -> Bench PS 3.3

And I got this simple sketch

Code: Select all

#include <SoftwareSerial.h>
SoftwareSerial mySerial(8, 7);
void setup()
{
  //Serial.begin(9600);
  Serial.begin(115200);
  mySerial.begin(115200);
}

void loop()
{
  if (mySerial.available())
    Serial.write(mySerial.read());
  if (Serial.available())
    mySerial.write(Serial.read());
}

It looks like everything works just fine, when i try like AT it responds

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AT 

OK

But when I try like AT+GMR is does this

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AT+GMR

AT version:1.1.0.0(May 11 2016 18:09:56)
SDK vershon:1.5.4(bep:0:

I won't gets the whole message. Same for listing APs with AT+CWLAP

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AT+CWLAP

+CWLAP:(3,"APTest1",-52,"84:b5:26:73:75:87#,1,-12,0)
+CWLAP:(4,"APTest2"ff6PRPO,063
3aa0,+43,91+,F,11)(k8'⸮⸮
⸮J
Pi,5"
(_-79,W"-d:8Ld8bd,A "::1C"B,2"+3sc16+""::6C"⸮$⸮⸮⸮Ҫ⸮bJ
LPe:f6+"F416):W9cd3LUCcf6
5-0::,AC,671W"Ao":"

I also have a small programmer, that has 3.3V connections, so I can wire it directly from EPS to that programmer and when I try these command, it works just fine. Am I doing something wrong or is there something I'm missing ?

I'm using Arduino UNO
I know that I can program the ESP directly, I'd like to try that when I get this to work.

Thanks

Posted: **Tue May 05, 2020 3:04 pm**

I recommend that you do not try to control the esp from you Ardunio. It can be done but people regularly post here with problems.

What you need is a USB to serial converter to interface you PC directly to the esp.
You don't say what module you have. Here is information about using the 01, programming other modules is a case of connecting to the appropriate pins:-https://medium.com/@aallan/getting-started-with-the-esp8266-270e30feb4d1

However as a newcommer you will save yourself a lot of headache by purchasing a NodeMCU or a Wemos D1 Mini. Both have the USB to serial interface built in.

ESP8266 Community Forum

Arduino + ESP8266 weird behavior

Arduino + ESP8266 weird behavior

Re: Arduino + ESP8266 weird behavior