Prototype Code

#include <OneWire.h>
#include <DallasTemperature.h>

// Pin definitions
#define DS18B20_PIN 4      // Temperature sensor data pin
#define POT_PIN A1      // Potentiometer analog pin
#define WATER_LEVEL_PIN 2  // Float switch (LOW when full)
#define VALVE1_PIN 8       // Normally closed valve 1 (mixer)
#define VALVE2_PIN 9       // Normally closed valve 2 (tank)

OneWire oneWire(DS18B20_PIN);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(9600);
  
  // Initialize pins
  pinMode(VALVE1_PIN, OUTPUT);
  pinMode(VALVE2_PIN, OUTPUT);
  pinMode(WATER_LEVEL_PIN, INPUT_PULLUP);
  
  // Start with both valves closed
  digitalWrite(VALVE1_PIN, HIGH);
  digitalWrite(VALVE2_PIN, LOW);

  // Initialize temperature sensor
  sensors.begin(); 
}

void loop() {
  int potValue = analogRead(POT_PIN);
  bool tankFull = digitalRead(WATER_LEVEL_PIN) == LOW;
  
  sensors.requestTemperatures();
  float currentTemp = sensors.getTempCByIndex(0);

  // Device control logic
  if(potValue <= 4) { // Device OFF
    digitalWrite(VALVE1_PIN, HIGH);
    digitalWrite(VALVE2_PIN, LOW);
    Serial.println("Device: OFF");
  }
  else { // Device ON
    float setpoint = map(potValue, 5, 1023, 15, 35);

    // Tank full override
    if(tankFull) {
      digitalWrite(VALVE1_PIN, HIGH);
      digitalWrite(VALVE2_PIN, LOW);
      Serial.print("Setpoint: ");
      Serial.print(setpoint, 1);
      Serial.print("C | Current: ");
      Serial.print(currentTemp, 1);
      Serial.println("C | Flow: Normal (Tank Full)");
    }
    else {
      if(currentTemp >= setpoint) {
        digitalWrite(VALVE1_PIN, LOW);
        digitalWrite(VALVE2_PIN, HIGH);
        Serial.print("Setpoint: ");
        Serial.print(setpoint, 1);
        Serial.print("C | Current: ");
        Serial.print(currentTemp, 1);
        Serial.println("C | Flow: Redirecting");
      }
      else {
        digitalWrite(VALVE1_PIN, HIGH);
        digitalWrite(VALVE2_PIN, LOW);
        Serial.print("Setpoint: ");
        Serial.print(setpoint, 1);
        Serial.print("C | Current: ");
        Serial.print(currentTemp, 1);
        Serial.println("C | Flow: Normal");
      }
    }
  }
  delay(1000); // Update every second
}