Control Relay with no WiFi

Solved
1

Hi there
I am new in the Blynk community and i am using ESP01 with relay module.
My project is to swith off the router at 02:00 and switch on at 02:30.
Switching off is easy using blynk timer, my problem is how can i switch on the relay,
since the router is off and there is internet connection.
Thank you

2

If your project uses Blynk.begin then swap to setting-up your WiFi connection yourself and swapping to Blynk.config and Blynk.connect.

Then, set a timeout timer that is triggered by your ‘off’ command which runs for 30 minutes and turns your relay back on again when the timer expires.

Pete.

3

Thank you Pete for your quick response.
As i am newbie i would like a little more explanation. Here is my code:
Edit:This is the modified code which does what i want.


//Blynk Home Automation


#define BLYNK_PRINT Serial            
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <ESP8266mDNS.h>  // For OTA with ESP8266
#include <WiFiUdp.h>  // For OTA
#include <ArduinoOTA.h>  // For OTA


BlynkTimer timer;
unsigned long Timeoff = (1000*60*60*3); // ms*60=min*60=hour *3= 3 Hours


int relay1State = LOW;



#define auth "xxxxxxxxxxxxxxxxxxxx"  // You should get Auth Token in the Blynk App.  
#define ssid "xxxxxxx"                   //Enter Wifi Name
#define pass "xxxxxxxx"                   //Enter wifi Password

//Static IP address configuration
IPAddress local_IP(192, 168, 0, xxx); ///
// Set your Gateway IP address
IPAddress gateway(192, 168, 0, xxx);

IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8);   //optional
IPAddress secondaryDNS(8, 8, 4, 4); //optional

// #define SERVER "blynk-cloud.com "             // Comment-out if use Blynk hosted cloud service
// #define PORT 8442

#define RELAY_PIN_1      0   //gpio0



#define VPIN_BUTTON_1    V12 

#define OTA_HOSTNAME "Home_Automation"


BLYNK_CONNECTED() {

  // Request the latest state from the server

  //  Blynk.syncVirtual(VPIN_BUTTON_1);


  // Alternatively, you could override server state using:
  Blynk.virtualWrite(VPIN_BUTTON_1, relay1State);

}

// When App button is pushed - switch the state

BLYNK_WRITE(VPIN_BUTTON_1) {
  relay1State = param.asInt();
  digitalWrite(RELAY_PIN_1, relay1State);
}

void RelayOff()
{
relay1State = LOW;
digitalWrite(RELAY_PIN_1, relay1State);
}


void setup()
{

  Serial.begin(115200);
  if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) {
    Serial.println("STA Failed to configure");
  }

  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

 Blynk.config(auth,"blynk-cloud.com", 8442);
  while (Blynk.connect(1000) == false) { 
  }  
 // Blynk.begin(auth, ssid, pass,"blynk-cloud.com", 8442);
  ArduinoOTA.setHostname(OTA_HOSTNAME);  // For OTA - Use your own device identifying name
  ArduinoOTA.begin();  // For OTA

  pinMode(RELAY_PIN_1, OUTPUT);
  digitalWrite(RELAY_PIN_1, relay1State);



  // Setup a function to be called every 100 ms

}

void loop()
{
  if (relay1State = HIGH) {
    timer.setTimeout(Timeoff, RelayOff);
  }
  Blynk.run();
  ArduinoOTA.handle();  // For OTA
  timer.run();
}
4

I have a simple idea i.e. use BLE or Bluetooth for this project. HTH :slight_smile: Also, If you need more help than you can simply reply to this :smiley:

5

Thank you for your response. It is now OK.

6

Welcome, if you ever need help on this, let us know :slight_smile:

7

Hi there
I am facing a problem with the timer.setTimeout function in my code.
The router is at NC of the relay connected.
At 02:30 every day and for 3 hours i switch off the relay and having so my router closed.
In my code i have defined “unsigned long Timeoff = (1000 * 60 * 60 * 3);” = 10.800.000 ms which is 3 hours or 180 min.
After that period the relay should switch on and the router will start again.
But i get 2 hours and 40 min and not 3 hours.
10.800.000 gives me 160 min
10.800.000L gives me 170 min.
I am confused.
Thank you