ESP8266 Community Forum

Posted: **Sat Aug 15, 2015 12:04 pm**

Hello there!

I've been trying to connect a ESP8266-01 to Arduino UNO, but I can't get them to communicate trought this simple sketch:

Code: Select all

#define LED_PIN 13

bool found_OK = 0;

void setup() {
  
  Serial.begin(115200);
  delay(200);
  Serial.setTimeout(1000);
  delay(200);

  pinMode(LED_PIN,OUTPUT);

  // Testing the LED
  digitalWrite(LED_PIN,HIGH);
  delay(300);
  digitalWrite(LED_PIN,LOW);
  delay(300);
  digitalWrite(LED_PIN,HIGH);
  delay(300);
  digitalWrite(LED_PIN,LOW);
  delay(300);
  
  }


void loop() {

  // LED is OFF
  digitalWrite(LED_PIN,LOW);
  delay(200);

  // Sends the AT Command
  Serial.print("AT\r\n");

  // Looks for the answer
  found_OK = Serial.find("OK");

  // If "OK" is found, lights up the LED
  digitalWrite(LED_PIN,found_OK);
  delay(1000);
  
}

The LED on pin 13 doesn't light up during the loop, neither does the blue LED on the ESP.

I tested the hardware setup using the BareMinimun example and Serial Monitor, so i guess the problem is the code itself.

Can someone help me? I have a feeling I'm missing some little detail...

Thank You!

Franco

EDITED:

For some reason, using the serial port on Arduino Uno (pins 0 and 1) to talk to the ESP does not work on Sketchs.

So I just used the SoftwareSerial function on pins 10 and 11 and it started working right away.

Thinking it through, this might be a known fact, since lots of Libs actually use SoftwareSerial to talk to the ESP, but took me forever to figure it out.

Posted: **Sun Aug 16, 2015 6:03 am**

That runs OK on my Linux machine 32 bit and an ESP-12 chip separately with an LED on Pin 13 but the LED does not light because it has to be taken low to light for me .
Serial terminal to the ESP showed AT repeatedly and the blue LED lit each time it was sent.

Changing its start state to High and the write to /1 ....divide by 1 did it ok for me for a quick test
digitalWrite(LED_PIN,LOW);
digitalWrite(LED_PIN,found_OK/1);
I left the setup writes as were and that worked OK too

Now a far as doing it through an arduino I think you have to have TX to TX and RX to RX between Arduino and ESP but I guess you have that sorted if the code is being loaded to the ESP. I think you are probably trying to light pin 13 on the Arduino so how will the ESP know the Arduino pin numbers? You could put an led on GPIO2 for a test

Posted: **Sun Aug 16, 2015 8:51 am**

Thank you for the reply, tytower! I figured out a way around my problem this morning.

ESP8266 Community Forum

Arduino Uno and ESP8266-01 Communication [RESOLVED]

Arduino Uno and ESP8266-01 Communication [RESOLVED]

Re: Arduino Uno and ESP8266-01 Communication

Re: Arduino Uno and ESP8266-01 Communication