ESP8266 is connected to Arduino Uno (2, 3 pins) and a relay to Arduino's pin 13.

ESP8266 is connected to Arduino Uno (2, 3 pins) and a relay's data input to Arduino's pin 12 and power for relay is provided from another source.

My system looks like this.

ESP8266 is connected to Arduino-Uno (2,3 pins) and a Relay to Arduino's pin 13.

Arduino gets data from server and switch on/off relay according to that signal. This system works perfectly for few hours and then suddenly crashes. In my wifi console I have

I have read this arduino question, but circuit diagram similar to that one. I get power from my PC to run Arduino.

This is my arduino code :

#include "WiFiEsp.h"
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2,3); // RX, TX
#endif
char ssid[] = "RPi"; // your network SSID (name)
char pass[] = "raspberry"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "192.168.50.1";
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10000L; // delay between updates, in milliseconds
int testLED = 12;
// Initialize the Ethernet client object
WiFiEspClient client;
void setup()
{
 pinMode(testLED, OUTPUT);
 // initialize serial for debugging
 Serial.begin(9600);
 // initialize serial for ESP module
 Serial1.begin(9600);
 // initialize ESP module
 WiFi.init(&Serial1);
 // check for the presence of the shield
 if (WiFi.status() == WL_NO_SHIELD) {
 Serial.println("WiFi shield not present");
 // don't continue
 while (true);
 }
 // attempt to connect to WiFi network
 while ( status != WL_CONNECTED) {
 Serial.print("Attempting to connect to WPA SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network
 status = WiFi.begin(ssid, pass);
 }
 Serial.println("You're connected to the network");
 
 //printWifiStatus();
}
void loop()
{
 // if there's incoming data from the net connection send it out the serial port
 // this is for debugging purposes only
 while (client.available()) {
 char c = client.read();
//code to run relay
 if(c == '#')
 {
 while(client.available() == 0) { } // Do nothing while we wait for the next value
 // reading the second charactor
 c = client.read();
 if(c == '1'){
 Serial.println("On");
 digitalWrite(testLED, HIGH);
 delay(600000);
 
 }
 else if(c == '0'){
 Serial.println("Off");
 digitalWrite(testLED, LOW);
 delay(600000);
 
 
 } //end of C cheking if-else 
 
 } //end of first charactor # if
//end of replay code
 
 }
 // if 10 seconds have passed since your last connection,
 // then connect again and send data
 if (millis() - lastConnectionTime > postingInterval) {
 httpRequest();
 }
}
// this method makes a HTTP connection to the server
void httpRequest()
{
 Serial.println();
 
 // close any connection before send a new request
 // this will free the socket on the WiFi shield
 client.stop();
 // if there's a successful connection
 if (client.connect(server, 80)) {
 Serial.println("Connecting...");
 
 // send the HTTP PUT request
 client.println(F("GET /simple.txt HTTP/1.1"));
 client.println(F("Host: localhost"));
 client.println("Connection: close");
 client.println();
 // note the time that the connection was made
 lastConnectionTime = millis();
 }
 else {
 
 WiFi.begin(ssid, pass);
 Serial.println("Reconnecting again");
 }
}

My system looks like this:

ESP8266 is connected to Arduino Uno (2, 3 pins) and a relay to Arduino's pin 13.

Arduino gets data from server and switches on/off relay according to that signal. This system works perfectly for few hours and then suddenly crashes. In my WiFi console I have:

I have read this Arduino question, but circuit diagram similar to that one. I get power from my PC to run Arduino.

This is my Arduino code :

#include "WiFiEsp.h"
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2, 3); // RX, TX
#endif
char ssid[] = "RPi"; // your network SSID (name)
char pass[] = "raspberry"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "192.168.50.1";
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10000L; // delay between updates, in milliseconds
int testLED = 12;
// Initialize the Ethernet client object
WiFiEspClient client;
void setup()
{
 pinMode(testLED, OUTPUT);
 // initialize serial for debugging
 Serial.begin(9600);
 // initialize serial for ESP module
 Serial1.begin(9600);
 // initialize ESP module
 WiFi.init(&Serial1);
 // check for the presence of the shield
 if (WiFi.status() == WL_NO_SHIELD) {
 Serial.println("WiFi shield not present");
 // don't continue
 while (true);
 }
 // attempt to connect to WiFi network
 while ( status != WL_CONNECTED) {
 Serial.print("Attempting to connect to WPA SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network
 status = WiFi.begin(ssid, pass);
 }
 Serial.println("You're connected to the network");
 //printWifiStatus();
}
void loop()
{
 // if there's incoming data from the net connection send it out the serial port
 // this is for debugging purposes only
 while (client.available()) {
 char c = client.read();
 //code to run relay
 if (c == '#')
 {
 while (client.available() == 0) { } // Do nothing while we wait for the next value
 // reading the second charactor
 c = client.read();
 if (c == '1') {
 Serial.println("On");
 digitalWrite(testLED, HIGH);
 delay(600000);
 }
 else if (c == '0') {
 Serial.println("Off");
 digitalWrite(testLED, LOW);
 delay(600000);
 } //end of C cheking if-else
 } //end of first charactor # if
 //end of replay code
 }
 // if 10 seconds have passed since your last connection,
 // then connect again and send data
 if (millis() - lastConnectionTime > postingInterval) {
 httpRequest();
 }
}
// this method makes a HTTP connection to the server
void httpRequest()
{
 Serial.println();
 // close any connection before send a new request
 // this will free the socket on the WiFi shield
 client.stop();
 // if there's a successful connection
 if (client.connect(server, 80)) {
 Serial.println("Connecting...");
 // send the HTTP PUT request
 client.println(F("GET /simple.txt HTTP/1.1"));
 client.println(F("Host: localhost"));
 client.println("Connection: close");
 client.println();
 // note the time that the connection was made
 lastConnectionTime = millis();
 }
 else {
 WiFi.begin(ssid, pass);
 Serial.println("Reconnecting again");
 }
}