ESP8266 and Arduino Interfacing

Question

I have connected Arduino with ESP8266 with

Arduino pin 2 connected to ESP's Tx Arduino pin 3 connected to ESP's Rx via Voltage Divider Arduino GND connected to ESP's GND Arduino 3v3 connected to ESP's CH_PD

I have powered ESP8266 using 1117 Voltage regulator

When I initially bought ESP8266 it was working properly(I could even set up a server) but now when I connect it to Arduino an endless stream of garbage values is seen on the Serial Monitor...

The arduino is programmed with the following code

#include <SoftwareSerial.h>
SoftwareSerial esp8266(2,3); // make RX Arduino line is pin 2, make TX Arduino line is pin 3.
 // This means that you need to connect the TX line from the esp to the Arduino's pin 2
 // and the RX line from the esp to the Arduino's pin 3
void setup()
{
 Serial.begin(9600);
 esp8266.begin(9600); // your esp's baud rate might be different
}
void loop()
{
 if(esp8266.available()) // check if the esp is sending a message 
 {
 while(esp8266.available())
 {
 // The esp has data so display its output to the serial window 
 char c = esp8266.read(); // read the next character.
 Serial.write(c);
 } 
 }
 if(Serial.available())
 {
 // the following delay is required because otherwise the arduino will read the first letter of the command but not the rest
 // In other words without the delay if you use AT+RST, for example, the Arduino will read the letter A send it, then read the rest and send it
 // but we want to send everything at the same time.
 delay(1000); 
 String command="";
 while(Serial.available()) // read the command character by character
 {
 // read one character
 command+=(char)Serial.read();
 }
 esp8266.println(command); // send the read character to the esp8266
 }
}

• fuenfundachtzig: Maybe it helps if you tell us what happened between "initially" and "now"?
• Majenko: Lose the Arduino and program the ESP directly. You can do it with the same language as Arduino. github.com/esp8266/Arduino - also supported in UECIDE - all you need is a USB -> UART dongle.
• Kluge: If the stream of garbage values comes in response to things you send to the ESP8266, then the problem is most likely the baud rate. For the ESP8266-01 modules that I have used, the default baud rate is 115200.
• AngryBird: I had already changed the Baud Rate of the Module to 9600 using AT+BAUD command..

Answer 1

There is a new command for the ESP8266 in AT version:0.50.0.0 - SDK version:1.4.0 that lets you explicitly set the full UART configuration:

AT+UART_CUR – set the current UART configuration This command sets the current UART configuration; it does not write to the flash. Hence there is no change in the default baud rate.

For example:

AT+UART_CUR=9600,8,1,0,0