Stuck with blynk code for Arduino nano+esp01 wifi module

[PeteKnight]

@burned_led

i tried uploading to the wifi module accidentally, but still the nano does’nt work

That’s a problem, as you will have over-written the factory AT firmware on the ESP-01, so it will no longer be able to act as a WiFi modem for your Nano.
You will need to restore the AT firmware to the ESP-01.

You are also getting this compiler warning:

@burned_led

Multiple libraries were found for "BlynkSimpleShieldEsp8266.h"

@burned_led

Multiple libraries were found for “BlynkSimpleShieldEsp8266.h”
Used: C:\Users\tejas\Documents\Arduino\libraries\Blynk_Esp8266AT_WM
Not used: C:\Users\tejas\Documents\Arduino\libraries\Blynk

I’d recommend that you un-install the 3rd party library that neds in _WM and stick with the official Blynk library, and ensure that you’re using version 0.6.1 if you’re using Blynk Legacy, or 1.0.1 if you’re using Blynk IoT.

This error message:

@burned_led

#error This code is intended to run on the Mega2560 platform!

is because you have this line of code in your sketch:

@burned_led

// Hardware Serial on Mega, Leonardo, Micro...
#define EspSerial Serial1

and you ignored this information:

@burned_led

// or Software Serial on Uno, Nano...
//#include <SoftwareSerial.h>
//SoftwareSerial EspSerial(2, 3); // RX, TX

The Arduino Uno and Nano only have one serial port (Serial0) so it’s impossible to connect the ESP-01 module to port Serial1, as it doesn’t exist.

TBH, you’d be better-off throwing the Nano and ESP-01 in the bin, and using either a NodeMCU, Wemos D1 Mini or ESP-32, as these have WiFi built-in, and are also much faster and more powerful than the Nano (and are easier to work with).

If you do want to persist with restoring the AT firmware on the ESP-01 and using it with the Nano then you need to read this (and I’d recommend that you read it ALL)…

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…

Pete.