Hello everyone,
looking at guidelines found here and there in the blink portal i managed to set up my room automation system, made up of 4 relays, and a servo that opens/closes the door lock.
I’m already quite satisfied with it even tough there are some minor issues i didn’t manage to solve even by looking everywhere.
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i don’t know how to transform the uptime seconds in the dd:hh:mm:ss format to show it with the display value widget on the app
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the 9g micro servo* i use buzzes sometimes when the action is completed, but its power supply is now controlled by a relay, so really a minor issue
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quite often when opening the blank app i get " your device was disconnected" and it only starts working after some seconds
hope you can help me optimize my code since I’m not really an expert 
thanks everyone for your work 
/*************************************************************
Download latest Blynk library here:
https://github.com/blynkkk/blynk-library/releases/latest
Blynk is a platform with iOS and Android apps to control
Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your
projects by simply dragging and dropping widgets.
Downloads, docs, tutorials: http://www.blynk.cc
Sketch generator: http://examples.blynk.cc
Blynk community: http://community.blynk.cc
Social networks: http://www.fb.com/blynkapp
http://twitter.com/blynk_app
Blynk library is licensed under MIT license
This example code is in public domain.
*************************************************************
This example runs directly on NodeMCU.
Note: This requires ESP8266 support package:
https://github.com/esp8266/Arduino
Please be sure to select the right NodeMCU module
in the Tools -> Board menu!
For advanced settings please follow ESP examples :
- ESP8266_Standalone_Manual_IP.ino
- ESP8266_Standalone_SmartConfig.ino
- ESP8266_Standalone_SSL.ino
Change WiFi ssid, pass, and Blynk auth token to run :)
Feel free to apply it to any other example. It's simple!
*************************************************************/
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
// define the physical pins the relays are connected to. Make sure you use GPIO numbers and not D numbers. D6 = GPIO12 etc
#define RELAY1_PIN 5 // D1
#define RELAY2_PIN 4 // D2
#define RELAY3_PIN 14 // D5
#define RELAY4_PIN 12 // D6
#define servoPin D0 // D0
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <TimeLib.h>
#include <WidgetRTC.h>
#include <ArduinoOTA.h>
#include <Servo.h>
#include <SPI.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "xxxxxxxxxxxxxx";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "xxxxxxxxx";
char pass[] = "xxxxxxx";
char hostOTA[] = "OTAUpdates";
char passOTA[] = "1234";
BlynkTimer timer;
WidgetRTC rtc;
Servo servo;
// Digital clock display of the time
void clockDisplay()
{
// You can call hour(), minute(), ... at any time
// Please see Time library examples for details
String currentTime = String(hour()) + ":" + minute() + ":" + second();
String currentDate = String(day()) + " " + month() + " " + year();
Serial.print("Current time: ");
Serial.print(currentTime);
Serial.print(" ");
Serial.print(currentDate);
Serial.println();
// Send time to the App
Blynk.virtualWrite(V1, currentTime);
// Send date to the App
Blynk.virtualWrite(V2, currentDate);
}
void myTimerEvent()
{
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V3, millis() / 1000);
}
BLYNK_READ(V2) {
Blynk.virtualWrite(V2, millis() / 1000);
}
BLYNK_READ(V1) {
Blynk.virtualWrite(V1, millis());
}
BLYNK_READ(V3) {
Blynk.virtualWrite(V3, millis());
}
// Keep this flag not to re-sync on every reconnection
bool isFirstConnect = true;
BLYNK_CONNECTED() {
if (isFirstConnect) {
Blynk.syncVirtual(V21, V22, V23, V24, V25);
isFirstConnect = false;
}
}
void setup()
{
// Debug console
Serial.begin(9600);
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);
servo.attach(servoPin);
// Begin synchronizing time
rtc.begin();
// Other Time library functions can be used, like:
// timeStatus(), setSyncInterval(interval)...
// Read more: http://www.pjrc.com/teensy/td_libs_Time.html
// Display digital clock every 1 seconds
timer.setInterval(1000L, clockDisplay);
// Setup a function to be called every second
timer.setInterval(1000L, myTimerEvent);
ArduinoOTA.setHostname(hostOTA);
//ArduinoOTA.setPassword(passOTA);
ArduinoOTA.onStart([]() {
Serial.println("OTA: Start");
});
ArduinoOTA.onEnd([]() {
Serial.println("\nOTA: End");
});
ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
});
ArduinoOTA.onError([](ota_error_t error) {
Serial.printf("Error[%u]: ", error);
if (error == OTA_AUTH_ERROR) Serial.println("OTA: Auth Failed");
else if (error == OTA_BEGIN_ERROR) Serial.println("OTA: Begin Failed");
else if (error == OTA_CONNECT_ERROR) Serial.println("OTA: Connect Failed");
else if (error == OTA_RECEIVE_ERROR) Serial.println("OTA: Receive Failed");
else if (error == OTA_END_ERROR) Serial.println("OTA: End Failed");
});
ArduinoOTA.begin();
Serial.println("OTA: Ready");
pinMode(RELAY1_PIN,OUTPUT);
pinMode(RELAY2_PIN,OUTPUT);
pinMode(RELAY3_PIN,OUTPUT);
pinMode(RELAY4_PIN,OUTPUT);
digitalWrite(RELAY1_PIN, HIGH); // most modules are LOW active... so on boot start inactive (HIGH)
digitalWrite(RELAY2_PIN, HIGH); // most modules are LOW active... so on boot start inactive (HIGH)
digitalWrite(RELAY3_PIN, HIGH); // most modules are LOW active... so on boot start inactive (HIGH)
digitalWrite(RELAY4_PIN, HIGH); // most modules are LOW active... so on boot start inactive (HIGH)
}
BLYNK_WRITE(21){ // virtual pin 21... create a button widget in SWITCH mode
if(param.asInt()){
digitalWrite(RELAY1_PIN, LOW); // if button is HIGH, turn on relay1
} else {
digitalWrite(RELAY1_PIN, HIGH); // if button is LOW, turn off relay1
}
}
BLYNK_WRITE(22){ // virtual pin 22... create a button widget in SWITCH mode
if(param.asInt()){
digitalWrite(RELAY2_PIN, LOW); // if button is HIGH, turn on relay1
} else {
digitalWrite(RELAY2_PIN, HIGH); // if button is LOW, turn off relay1
}
}
BLYNK_WRITE(23){ // virtual pin 23... create a button widget in SWITCH mode
if(param.asInt()){
digitalWrite(RELAY3_PIN, LOW); // if button is HIGH, turn on relay1
} else {
digitalWrite(RELAY3_PIN, HIGH); // if button is LOW, turn off relay1
}
}
BLYNK_WRITE(24){ // virtual pin 24... create a button widget in SWITCH mode
if(param.asInt()){
digitalWrite(RELAY4_PIN, LOW); // if button is HIGH, turn on relay1
} else {
digitalWrite(RELAY4_PIN, HIGH); // if button is LOW, turn off relay1
}
}
BLYNK_WRITE(V25){
servo.write(param.asInt());
}
void loop()
{
ArduinoOTA.handle();
Blynk.run();
timer.run(); // BlynkTimer is working...
}
*the nodemcu is connected to the lolin base shield, 5v powered, which powers itself the nodemcu, the 4 relays module, and the servo
EDIT - 
