Arduino Uno + ESP8266 12E + Blynk + Relay

Hiorii · June 22, 2017, 11:35pm

Hello everyone,

First of all this is my first post here. I started adventure with arduino and programming 2 months ago. So I am new in this topics.
Untill now I realized few projects including Blynk connected with arduino. The last one was similar to one described in topic but I used the ENC28j60 instead of ESP8266 module and then it worked fine.
The problem started with ESP module…
Short description of project:

The main idea is to control AC light with Blynk App support.
First of all I made a connection according to picture below:

As power source I used the USB phone charger connected with step by voltage converter to get in final the 3.3V source.
I additionally connected the Arduino Uno with relay module like this:
Arduino ====> Relay module
5V ====> VCC
GND ====> GND
Pin 5 ====> IN1
Everythink you can see in picture below (sorry for quality)

And for now I did almost every step (with sooooo many problems :D). Here I mean:

I checked if arduino is connected with ESP module by serial port -> system report “ready” status
I upload the below (tample) Arduino IDE sketch for my project:

 #define BLYNK_PRINT Serial


#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "***";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "***";
char pass[] = "***";



void setup()
{
  // Debug console--
  Serial.begin(9600);

  Blynk.begin(auth, ssid, pass);

}

void loop()
{
  Blynk.run();
   
}

And finally I started the New project in Blynk. I set the Arduino uno as a hardware model and WiFi as connection type. Then I added the Button and set the Output to D5.

And now (close to the end of project) I met with a problem. After pushing the connect button (in up-right corner) I receive the information that device is connected (Online). Then when I try to push the button to Active Relay - nothing happens
Whats more. I tried with different pins on Arduino with the same results. And I don’t know why (probably because I have still small knowladge) but when I set the Button output value to D2 - after connection when I push it then the diod on ESP module Turn OFF and Turn ON.
I tried to find solution on this forum and in many other places for last 3 days but without any results. Thats why I decided to ask You for help. Do you know what did I wrong or what should I add to project to make connection between the Blynk and relay work correct?
Write if you will need some more or detailed informations from my side.

Lichtsignaal · June 23, 2017, 8:33pm

You are using the wrong sketch. You should use rhe esp as wifi shield sketch for this setup. And your esp should run the AT firmware.

Hiorii · June 23, 2017, 9:27pm

Thank you so much for your feedback! I really need help here
Anyway I am not sure if I good understand. Is it below sketch?

#define BLYNK_PRINT Serial


#include <SPI.h>
#include <WiFi.h>
#include <BlynkSimpleWifi.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "***";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "***";
char pass[] = "***";

void setup()
{
  // Debug console
  Serial.begin(115200);

  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);
}

void loop()
{
  Blynk.run();
}

When I use this code it upload correctly to Arduino board aswell. Anyway right now I can not connect blynk to esp8266 (“Device is offline”)

Just to be sure:

In Arduino IDE should I use above sketch?
In Arduino IDE Generic ESP 8266 should be chosen right now?
In Blynk I should choose Arduino Uno or Generic board as device?

“And your esp should run the AT firmware. ”

You mean I should flash it?