Hello everyone, I desing a pcb (kind of PLC) that has arduino, w5500 mini ethernet module, relay and some other components. I test my pcb on my desk there is no problem, everything works perfectly. after that I place this pcb in a electrical enclosure that have some contactor and some curcuit breaker (fuse).I just connect 12v and ethernet cable to my card (without relay connection and input cable) Sometimes once contactor pulls and leave, My connection was broken and program branches into reconnect routine and reconnect successfully. What might be reason that cause this issue ? Codes are as follows : ``#include

include

define MSG_BUFFER_SIZE (50)

char msg[MSG_BUFFER_SIZE];

SoftwareSerial newPort(2, 3); // Rx:2 Tx:3

// Update these with values suitable for your network. byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED }; IPAddress ip(162,17,200,23); IPAddress server(162,17,200,22);

EthernetClient ethClient; PubSubClient client(ethClient);

const char clientName = "Eth"; //const char topic = ""; // Inputs and Outputs

int output_timer = 4; int output_rotate = 5; int output_water = 6 ; int output_power = 7;

int input_align = 8; int input_phase = 9; int input_water = A0; int input_move = A1; int input_pump = A2; int input_mode=A3;

// A4 A5 I2C için kullanılabilir A6 A7 boşta. I2C kullanılmayacaksa 4 tane boş pin var.

bool status_conn = false ;

volatile int sec=0;

String command_water; String command_power; String command_rotate; int command_tour; int command_speed_sec;

unsigned long oldTime=0; unsigned long newTime;

void callback(char topic, byte payload, unsigned int length) {

Serial.print(topic); String msg;

if (!(strcmp(topic,"eth/commands"))){

  for (int i=0;i<length;i++) {

msg+=(char)payload[i];

}

//Serial.println(msg); command_power = msg.substring(0,3); command_water = msg.substring(4,7); command_rotate = msg.substring(8,11); command_tour = msg.substring(12,13).toInt(); command_speed_sec = msg.substring(14,17).toInt(); command_speed_sec = 60 * command_speed_sec / 100;

//Serial.println(command_power); //Serial.println(command_water); //Serial.println(command_rotate); Serial.println(command_speed_sec);

//msg="";

Serial.println(); }

void reconnect() { Serial.print("State:"); Serial.println(client.state());

// Loop until we're reconnected while (!client.connected()) { Serial.print("Attempting MQTT connection..."); // Attempt to connect if (client.connect(clientName,"eth/will",1,true,"disconnected")) { Serial.println("connected");

status_conn = true;

  // Subscribe topics
  client.subscribe("eth/commands",1);

} else {
  Serial.print("failed, rc=");
  Serial.print(client.state());
  Serial.println(" try again in 5 seconds");
  status_conn = false;
  // Wait 5 seconds before retrying
  delay(5000);
}

} }

void setup() { Serial.begin(115200);

pinMode(output_timer,OUTPUT); pinMode(output_rotate,OUTPUT); pinMode(output_water,OUTPUT); pinMode(output_power,OUTPUT);

digitalWrite(output_timer,HIGH); digitalWrite(output_rotate,HIGH); digitalWrite(output_water,HIGH); digitalWrite(output_power,HIGH);

pinMode(input_align,INPUT_PULLUP); pinMode(input_phase,INPUT_PULLUP); pinMode(input_water,INPUT_PULLUP); pinMode(input_move,INPUT_PULLUP); pinMode(input_pump,INPUT_PULLUP); pinMode(input_mode,INPUT_PULLUP);

client.setServer(server, 1883); client.setCallback(callback); Ethernet.begin(mac, ip);

//  Timer1 Ayarlanması

cli(); // tüm interruptlar dev dışı TCCR1A = 0;// TCCR1A register 0'lanıyor TCCR1B = 0;// TCCR1B register 0'lanıyor TCNT1 = 0;//sayac değeri 0'la // OCRxA karşılaştırma registeri 1Hz değer için ayarlanıyor //16 MHz osilatör,1Hz timer1 ın çalışma frekansı,1024 prescalar OCR1A = 15624;// = (1610^6) / (11024) - 1 (değer 65536 dan küçük) // CTC mod açılıyor. TCCR1B |= (1 << WGM12); // CS10 ve CS12 bitleri 1024 prescaler için ayarlanıyor TCCR1B |= (1 << CS12) | (1 << CS10);
// timer karşılaştırma interruptı aktifleştiriliyor TIMSK1 |= (1 << OCIE1A); sei();//Tüm interruptları çalıştır

delay(1500); newPort.begin(115200); }

// timer aktif olabilmesi için haberleşme,power,mod ve hiza kontrol edilir, herşey normal ise zamana göre timer çıkış verir. ISR(TIMER1_COMPA_vect) {

sec++; if(sec==60) sec=0;

if ( (sec < command_speed_sec) && (command_power.equals("pon")) && (status_conn == true) && (digitalRead(input_mode)== HIGH) && (digitalRead(input_align)== HIGH) ) digitalWrite(output_timer,LOW); else digitalWrite(output_timer,HIGH);

Serial.println(sec); // for debugging purpose Serial.println(status_conn); // for debugging purpose

}

void loop() { delay(60); // kontaktör çektiğinde ve bıraktığında anlık haberleşme kesilmesini önlemek için if (!client.connected()) { reconnect(); } client.loop();

newTime = millis(); if(newTime-oldTime > 1000){ // **** 1 sec events starts

String stat=""; char stats[20]; if (digitalRead(input_align)== HIGH) { stat+="on "; } else stat+="off ";

if (digitalRead(input_phase)== HIGH)