ESP-01, arduino MEGA2560, blynk... ESP is not responding

[NejdeTo]

Hello, I have a problem with esp-01. I am trying to use it with arduino mega2560 & blynk. When I try to use blynk arduino mega example, I get error: “ESP is not responding”. I’ve been trying to fix this error for like 15 hours searching every forum, every tutorial i could find… I have even tried to use new jumpers between arduino, breadboard and esp8266. I tried switching every combination of TX=>RX RX=>TX OR TX=>TX TX=>RX and baud rates… still same error. Then I realized that almost all AT commands give me ERROR, so I flashed some newer version, but I am not able to flash using “flash_download_tool_3.9.2”. It just keeps syncing forever and it prints “…” in cmd. I’ve even tried “flash_download_tool_v3.8.5” but same error. I’ve noticed that I can flash the firmware only using “esp8266_flasher” (with RX=>RX and TX=>TX. When I do otherwise and try to upload a sketch from arduino, the whole ide just keeps loading after hitting upload button) which takes only one .bin file. I couldnt find latest version in one .bin file, so I have "AT version:1.1.0.0 SDK version:1.5.4(baaeaebb)
" at the moment. AT commands finally works, I can connect ESP to my wifi via AT commands, I can ping the ESP from my computer, but I still get that “ESP is not responding” error while trying blynk example. I tried to upload sketch with programming pin to GND or without, or with reset pin… nothing changes the “ESP is not responding” error. Right now I have set the baud rate to 9600 in both esp-01(AT command) and arduino. Does anyone have any idea to fix it? I think I am going insane… Also sorry for my english. Some more info:

 SPI Mode       : DIO
 SPI Flash Size & Map: 8Mbit(512KB+512KB)
 Blynk version: 1.0.1

[John93]

Post you sketch and wiring diagram please.

[PeteKnight]

I’d start by reading this…

Understanding hardware and software serial ports

I’m still seeing frequent posts, mostly from new members of the forum, who are confused about how to add WiFi or Bluetooth connectivity to devices like the Arduino Uno, Nano or Mega, or from people who are trying to use serial communication with some other type of peripheral. I thought I’d try to put together some guidance on how to do this properly. First things first though – if you’re using a device such as an Uno, Nano or Mega that doesn’t have built-in internet connectivity then you shoul…

I don’t really understand the part where you said that you’ve flashed new AT firmware to your ESP-01 using the Arduino IDE. As far as I’m aware, that’s not possible.

I also don’t understand this part…

@NejdeTo

I tried to upload sketch with programming pin to GND or without, or with reset pin

It sounds like you are trying to upload the sketch to the ESP-01, rather than the Mega.

Pete.

[NejdeTo]

Thank you so much. I read your “Understanding hardware and software serial ports” post and noticed that you mentoined 18 and 19 pins there. I’ve been using pins 0,1 the whole time. I didn’t find it wrong because I used to flash firmware through these pins(esp8266_flasher) and also the esp-01 was blinking blue while uploading a sketch from arduino while using these pins. So changing the pins from 0,1 to 18,19 solved the problem, thanks.

[PeteKnight]

Good, glad to hear that it was worth taking the time to write that guide.

Pete.