Failed to connect to ESP8266: Timed out waiting for packet header

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1

I am facing some problem which is Failed to connect to ESP8266

This is the code:

#include <SoftwareSerial.h>
SoftwareSerial espSerial(0, 1); // RX, TX

void setup() {
  Serial.begin(9600);
  espSerial.begin(9600);
  delay(1000);
  espSerial.println("AT+RST"); // reset the ESP8266 module
  delay(1000);
  espSerial.println("AT+CWMODE=1"); // set the module to client mode
  delay(1000);
  espSerial.println("AT+CWJAP=\"dlink-04FF\",\"gbudr79638\""); // replace with your Wi-Fi network credentials
  delay(5000);
}

void loop() {
  float temperature = 25.0; // replace with your own data to be sent to ThingSpeak
  String apiKey = "05WSZUIIGI84SCAB"; // replace with your own ThingSpeak API key
  String url = "GET /update?key=" + apiKey + "&field1=" + String(temperature);
  espSerial.println("AT+CIPMUX=0");
  delay(1000);
  espSerial.println("AT+CIPSTART=\"TCP\",\"api.thingspeak.com\",80");
  delay(1000);
  espSerial.print("AT+CIPSEND=");
  espSerial.println(url.length() + 2);
  delay(1000);
  espSerial.println(url);
  delay(5000); // wait for the response from ThingSpeak
}

This is the error:
. Variables and constants in RAM (global, static), used 28740 / 80192 bytes (35%)
║ SEGMENT BYTES DESCRIPTION
╠══ DATA 1496 initialized variables
╠══ RODATA 1100 constants
╚══ BSS 26144 zeroed variables
. Instruction RAM (IRAM_ATTR, ICACHE_RAM_ATTR), used 61895 / 65536 bytes (94%)
║ SEGMENT BYTES DESCRIPTION
╠══ ICACHE 32768 reserved space for flash instruction cache
╚══ IRAM 29127 code in IRAM
. Code in flash (default, ICACHE_FLASH_ATTR), used 243000 / 1048576 bytes (23%)
║ SEGMENT BYTES DESCRIPTION
╚══ IROM 243000 code in flash
esptool.py v3.0
Serial port COM3
Connecting......................................_____

A fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header

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2

I can't really help you.

  1. Which exact board are you using?
  2. The ESP8266 is a 3,3V device.Your feeding is 5V signals (Uno's TX) which might not be healthy for the ESP8266.
  3. You're using the Uno as a TTL-to-USB adapter. Make sure that no program is running on the Uno; safest way is to jeep the Uno board in reset,
3

Have you seen this:

and this:

what do your orange and yellow wires connect to?

and more fundamentally - if you have an application that requires wifi, why not do it all on a board that supports it? Or is it your idea that the ESP-01 will do that?

4
  1. Arduino uno v3
  2. I confirm twice and it feeding in 3.3V correctly.
  3. I think that is not working and showing same output.
5

Orange and yellow wires is connect from ESP8266 to arduino uno which is
Orange = RX (esp8266) to RX <- 0 (arduino uno)
Yellow = TX (esp8266) to RX -> 1 (arduino uno)

Because I am done all of works in tinkercard and this is the last step which is connect to wifi. Now I am trying to setup correctly and facing this problem right now.

6

I could see that; I was asking about the other one.

I was talking about the TX of the Arduino; that is a 5V signal and can possibly damage the ESP8266.

7

USB is connected trough Rx and Tx pins on Arduino uno, so you cant use them, use Software serial with other pins.

8

@noobmastha

You can use those pins if there is no code running on the Uno; either empty sketch or keep ino in reset.

9

Pity about the bold print, Well that code is supposed to run an the UNO i guess, but if you use swSerial, you should not use the hwSerial pins.

What it looks like to me is that you have code that will make use of the AT-firmware of the ESP and control the ESP from the UNO. You should try and upload that code onto the UNO.

I don't really support that method. It is so much more efficient to upload your own firmware onto the ESP.

10

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