Error while uploading code to ESP8266 through Arduino Mega 2560

Question

I am sorry for posting this question for the nth time but I am still not able to find a solution for this error.

I am trying to upload the WiFiScan(Arduino IDE example program)program code to ESP8266 using Arduino Mega 2560. I followed the procedure given here. And I tried uploading it with "Generic ESP8266 Module" and "Adafruit HUZZAH ESP8266" selected as the Board. But I am still getting the following error.

trying to connect
 espcomm_send_command: sending command header
 espcomm_send_command: sending command payload
warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed

Edited to add: enter image description here

Connections-

ESP8266 - Arduino Mega2560

Tx - Tx1(Pin 18)

Rx - Rx1(Pin 19)

Gnd - Gnd

Vcc - 3.3V (Directly from Arduino's 3.3V pin)

CH_PD - 3.3V (Directly from Arduino's 3.3V pin)

GPIO0 - Push button K2 (refer photo)

RST - Push button K1

While pressing the K2 button(Flash button - GPIO0), I clicked the K1 button(Reset button - RST) and then released K2. According to the document, this should bring the ESP8266 to flash mode. Now when I upload the code, it throws the above error.

• gre_gor: That tutorial doesn't have anything to do with an Arduino Mega and you didn't tell us how you wired it. We can only guess what is wrong.
• Squats: Add a photo clearly showing your devices and wiring and you might get a better response.
• mac and mocha: As suggested, I've included the connection details in the question. @gre_gor, Squats
• Jaromanda X: tx to tx and rx to rx ??? have you tried the obvious? tx to rx and rx to tx, seeing as that's how serial connections work

Answer 1

After googling for several hours, I was able to figure out the reason. Thanks to this link. Transferring data to ESP8266 with Arduino acting as USB to Serial converter did not work. Using a USB to TTL converter, and following this link you can easily transfer data to ESP8266.

• Fusseldieb: My Arduino Mega worked as a USB to Serial converter just fine...
• mac and mocha: @Fusseldieb could you please tell me how you uploaded data using Arduino Mega?
• Fusseldieb: I just plugged TX to TX, RX to RX, GND to GND and shorted RST to GND, causing the Arduino to loop continuously on reset. I also chosen "Tools" -> "Programmer" -> "Arduino as ISP". Then I uploaded the sketch just fine.
• Jaromanda X: I just plugged TX to TX, RX to RX - no you didn't
• Delta_G: Why do I see so many people today with the same Tx-Tx Rx-Rx problem. It's like there was something in the weather today. Think of it this way, when you have a conversation with someone, do you talk into their mouth and listen to their ears?