I'm trying to make a PID. But there are some relay issues. Please help

[connection]

I'm trying to make a PID with many other logics along with that. But due to some reasons my relay is turning off and not turning on again. Please can u check the code and help me with it!!

#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <max6675.h>
#include <FlowSensor.h>
#include <FlowSensor_Type.h>

#define Relay_Pin1 9 // Relay Heater
#define Relay_Pin2 10 // Realy Pump
#define Relay_Pin3 11 // Relay Valve
const int Start_Pin = 12;
int button_state = 0;

float v1;
float setTemp1 = 40.00;

int thermoSCK = 2;
int thermoCS = 3;
int thermoSO = 4;
MAX6675 thermocouple1(thermoSCK, thermoCS, thermoSO);

uint8_t degree[8]  = {140,146,146,140,128,128,128,128};

const int Flow_sensor_Pin = 8;
float thresholdFlowRate = 0.0;
volatile int count;

LiquidCrystal_I2C lcd1(0x27, 16, 2); // LCD 1
LiquidCrystal_I2C lcd2(0x26, 16, 2); // LCD 2

void setup() {
  pinMode(Relay_Pin1, OUTPUT);
  pinMode(Start_Pin, INPUT_PULLUP); // Assuming Start_Pin is pulled up internally
  
  // Initialize the LCDs
  lcd1.begin();
  lcd2.begin();
  
  Serial.begin(9600);
  
  lcd1.backlight();
  lcd2.backlight();
  lcd1.createChar(0, degree); 
  delay(500);

  pinMode(Flow_sensor_Pin, INPUT);
  v1 = thermocouple1.readCelsius();
}

void loop() { 
{  if  (v1 < setTemp1) {
  digitalWrite(Relay_Pin1, HIGH);}
  else if  (v1 >= setTemp1) {
  digitalWrite(Relay_Pin1, LOW);}
  delay(2000);
}
  lcd1.clear();
  lcd1.setCursor(0, 0);
  lcd1.print("SV  OIL_HEAT  PV");
  lcd1.setCursor(0,1);
  lcd1.print("40.00C");
  lcd1.setCursor(9,1);
  lcd1.print(thermocouple1.readCelsius());
#if ARDUINO >= 100
  lcd1.write((byte)0);
#else
  lcd1.print(0, BYTE);
#endif
  lcd1.print('C');
  delay(1000);

}```

[JCA34F]

@connection

else if (v1 >= setTemp1) {

Try:

else if (v1 >= setTemp1 + 1.0) {

[connection]

Thanks for ur suggestion. Sorted..

[connection]

can anyone please explain this error.

 void FlowSensor::begin(void (*userFunc)(void), bool pullup = false)
      ^~~~~~~~~~
In file included from C:\Users\Kiran\Documents\Arduino\libraries\FlowSensor-Arduino-master\src\FlowSensor.cpp:13:0:
C:\Users\Kiran\Documents\Arduino\libraries\FlowSensor-Arduino-master\src\FlowSensor.h:38:7: error: candidate is: void FlowSensor::begin(void (*)())
  void begin(void (*userFunc)(void));
       ^~~~~
exit status 1
Error compiling for board Arduino Uno.

[connection]

this program I'm working with

#include <FlowSensor_Type.h>


#include <max6675.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>


const int thermo1CLK = 2; // MAX6675 CLK pin sensor1
const int thermo1CS = 3;  // MAX6675 CS (Chip Select) pin sensor1
const int thermo1DO = 4;  // MAX6675 DO (Data Out) pin sensor1
const int thermo2CLK = 5; // MAX6675 CLK pin sensor2
const int thermo2CS = 6;  // MAX6675 CS (Chip Select) pin sensor2
const int thermo2DO = 7;  // MAX6675 DO (Data Out) pin sensor2


const int relayPin1 = 9;   // Heater pin connected to the relay
const int relayPin2 = 10;  // Pump pin connected to the relay
const int relayPin3 = 11;  // solinoid valve pin connected to the relay

const int start_pin = 12;

MAX6675 thermocouple1(thermo1CLK, thermo1CS, thermo1DO);
const float TEMPERATURE_THRESHOLD = 40.0; // Adjust as needed

MAX6675 thermocouple2(thermo2CLK, thermo2CS, thermo2DO);

uint8_t degree[8]  = {140,146,146,140,128,128,128,128};

#define type YFS201
unsigned char Flow_sensor_Pin = 8;
volatile int pulseCount;  // Flow meter pulse counter
float flowrate = 450;  // Number of pulses per milliliter
float totalVolume = 0.0;  // Total volume accumulated
float setVolume = 1.0;  // Example set volume in liters


LiquidCrystal_I2C lcd1(0x27, 16, 2); // LCD 1
LiquidCrystal_I2C lcd2(0x26, 16, 2); // LCD 2

void pulseCounter() {
  pulseCount++;
}


void setup() {
  Serial.begin(9600);
  pinMode(relayPin1, OUTPUT);
  digitalWrite(relayPin1, LOW); // Initialize relay OFF
  pinMode(start_pin, INPUT_PULLUP); // Assuming Start_Pin is pulled up internally

  lcd1.begin();
  lcd2.begin();
  lcd1.backlight();
  lcd2.backlight();
  lcd1.createChar(0, degree); 
  delay(500);

  pinMode(Flow_sensor_Pin, INPUT);
  digitalWrite(Flow_sensor_Pin, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(Flow_sensor_Pin), pulseCounter, FALLING);
  
  pulseCount = 0;
  lcd2.setCursor(0, 0);
  lcd2.print("Given Value:  1L");
  lcd2.setCursor(0, 1);
  lcd2.print("Present:");
}

void loop() {
  float temperature1 = thermocouple1.readCelsius();

  lcd1.clear();
  lcd1.setCursor(0, 0);
  lcd1.print("SV  OIL_HEAT  PV");
  lcd1.setCursor(0,1);
  lcd1.print("40.00C");
  lcd1.setCursor(9,1);
  lcd1.print(thermocouple1.readCelsius());
  #if ARDUINO >= 100
  lcd1.write((byte)0);
#else
  lcd1.print(0, BYTE);
#endif
lcd1.print('C');
delay(2500); 
  
  lcd1.clear();
  lcd1.setCursor(0, 0);
  lcd1.print("Body_Oil_Temp PV");
  lcd1.setCursor(9,1);
  lcd1.print(thermocouple2.readCelsius()); 
#if ARDUINO >= 100
  lcd1.write((byte)0);
#else
  lcd1.print(0, BYTE);
#endif
  lcd1.print('C');
delay(2500); // Adjust the delay as needed


  if (temperature1 > TEMPERATURE_THRESHOLD) {
    digitalWrite(relayPin1, HIGH); // Turn the relay ON
  } else {
    digitalWrite(relayPin1, LOW); // Turn the relay OFF
  }
  {
  detachInterrupt(digitalPinToInterrupt(Flow_sensor_Pin));
  {
    
    //flowrate = pulseCount / 450; // Replace 
     if (pulseCount >= 1) {  // Only increment volume if there are pulses
    flowrate += (pulseCount / flowrate);

  
  // Add current flow to total volume
  totalVolume = flowrate;

    // Display total volume on LCD
    lcd2.setCursor(10, 1);
    lcd2.print(totalVolume, 1);
    lcd2.print("L");
    pulseCount = 0;
  }

  // Compare total volume with set volume and display result
  if (totalVolume >= setVolume) {
  delay(100);
  }
  }
  attachInterrupt(digitalPinToInterrupt(Flow_sensor_Pin), pulseCounter, FALLING);
  }}```