CIRCUIT DIAGRAM No.1
NOTE :- Use the given circuit diagram if your Node Mcu is able to supply the necessary 5V to the relay Board. This Setup Does not uses Arduino Uno.
CIRCUIT DIAGRAM No.2
NOTE :- If you DONOT plan on making a case for the circuit. This uses Arduino as Node MCU didn’t supply enough power to trigger relay ON/OFF.
CIRCUIT DIAGRAM No.3
NOTE :- If you plan to make a circuit enclosed in a case like i showed you in the video
// wifi controlled home automation using Blynk App & ESP8266
#define BLYNK_TEMPLATE_ID "TMPL3fRiEDRer"
#define BLYNK_TEMPLATE_NAME "HOME AUTO"
#define BLYNK_AUTH_TOKEN "RVaoiEgZYoqI7mQb-BkA7fJ1FCDjfw5G"
#define BLYNK_PRINT Serial
#include <gpio.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
char auth[] = BLYNK_AUTH_TOKEN;
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "RAMA 4G";
char pass[] = "RAMA@ABE";
//in the below code, we have set all values reverse
//For value==1, digitalWrite is "LOW" as the realy module is active "LOW" to turn device ON.
//For value==0, digitalWrite is "HIGH" as Optocoupler based relay is turned OFF when HIGH Input is given
BLYNK_WRITE(V1)
{
int value = param.asInt();
Serial.println(value);
if(value == 1)
{
digitalWrite(D0, LOW);
Serial.println("LED ON"); //Setting Digital PIN as LOW to turn ON Device if relay module is "active low"
}
if(value == 0)
{
digitalWrite(D0, HIGH);
Serial.println("LED OFF");//Setting Digital PIN as HIGH to turn OFF Device if relay module is "active low"
}
}
BLYNK_WRITE(V2)
{
int value = param.asInt();
Serial.println(value);
if(value == 1)
{
digitalWrite(D1, LOW);
Serial.println("LED ON");
}
if(value == 0)
{
digitalWrite(D1, HIGH);
Serial.println("LED OFF");
}
}
BLYNK_WRITE(V3)
{
int value = param.asInt();
Serial.println(value);
if(value == 1)
{
digitalWrite(D2, LOW);
Serial.println("LED ON");
}
if(value == 0)
{
digitalWrite(D2, HIGH);
Serial.println("LED OFF");
}
}
BLYNK_WRITE(V4)
{
int value = param.asInt();
Serial.println(value);
if(value == 1)
{
digitalWrite(D3, LOW);
Serial.println("LED ON");
}
if(value == 0)
{
digitalWrite(D3, HIGH);
Serial.println("LED OFF");
}
}
void setup()
{
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
pinMode(D0,OUTPUT); //GPIO 16 (equivalent to PIN 16 of Arduino)
pinMode(D1,OUTPUT); //GPIO 05 (equivalent to PIN 05 of Arduino)
pinMode(D2,OUTPUT);//GPIO 04 (equivalent to PIN 16 of Arduino)
pinMode(D3,OUTPUT);//GPIO 00 (equivalent to PIN 00 of Arduino)
}
void loop()
{
Blynk.run();
}