arduino/DINOCOOL_RLY_MK3_OilSense/DINOCOOL_RLY_MK3_OilSense.ino

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <avr/wdt.h>

#define i2c_Address 0x3C // Change this if your OLED has a different I2C address
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define ONE_WIRE_BUS1 2 // D2 pin for the first DS18B20 sensor
#define ONE_WIRE_BUS2 7 // D7 pin for the second DS18B20 sensor
#define FAN1_PIN 3      // D3 pin for FAN1
#define FAN2_PIN 4      // D4 pin for FAN2
#define OVERRIDE_FAN1_PIN 5 // D5 pin for overriding FAN1 (pulled to ground to activate)
#define OVERRIDE_FAN2_PIN 6 // D6 pin for overriding FAN2 (pulled to ground to activate)

// 21 characters wide
// 6 down (plus half)

Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
OneWire oneWire1(ONE_WIRE_BUS1);
OneWire oneWire2(ONE_WIRE_BUS2);
DallasTemperature sensors1(&oneWire1);
DallasTemperature sensors2(&oneWire2);

bool fan1Active = false;
bool fan2Active = false;

void enableWatchdog() {
  cli();
  wdt_reset();
  MCUSR = WDRF;
  WDTCSR |= (1 << WDCE) | (1 << WDE);
  WDTCSR = (1 << WDIE) | (1 << WDP3) | (1 << WDP0); // Interrupt every 8 seconds
  sei();
}

void setup() {
  Serial.begin(9600);

  pinMode(FAN1_PIN, OUTPUT);
  pinMode(FAN2_PIN, OUTPUT);
  pinMode(OVERRIDE_FAN1_PIN, INPUT_PULLUP);
  pinMode(OVERRIDE_FAN2_PIN, INPUT_PULLUP);

  if (!display.begin(i2c_Address)) {
    Serial.println(F("SH110X allocation failed"));
    for (;;);
  }

  sensors1.begin(); // Initialize the first DS18B20 sensor
  sensors2.begin(); // Initialize the second DS18B20 sensor

  enableWatchdog(); // Enable watchdog timer

  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  wdt_reset(); // Reset watchdog timer

  display.clearDisplay();

  // Set text size and color
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);

  // Read temperatures from both DS18B20 sensors
  sensors1.requestTemperatures();
  sensors2.requestTemperatures();
  
  float temperatureC1 = sensors1.getTempCByIndex(0);
  float temperatureC2 = sensors2.getTempCByIndex(0);

  // Validate temperature readings
  if (isValidTemperature(temperatureC1)) {
    // Display temperatures on the screen in Celsius with one decimal place
    display.setCursor(0, 0);
    display.print("TempClt1: ");
    display.print(temperatureC1, 1);
    display.print(" C");
  } else {
    display.setCursor(0, 0);
    display.print("TempClt1: Invalid");
  }

  if (isValidTemperature(temperatureC2)) {
    display.setCursor(0, 10);
    display.print("TempClt2: ");
    display.print(temperatureC2, 1);
    display.print(" C");
  } else {
    display.setCursor(0, 10);
    display.print("TempClt2: Invalid");
  }

  // Check for override inputs
  bool overrideFan1 = digitalRead(OVERRIDE_FAN1_PIN) == LOW; // Pulled to ground to activate (active LOW)
  bool overrideFan2 = digitalRead(OVERRIDE_FAN2_PIN) == LOW; // Pulled to ground to activate (active LOW)

  // Control FANs based on override inputs and temperature thresholds
  if (overrideFan2) {
    digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
    digitalWrite(FAN2_PIN, HIGH); // Turn ON FAN2
    fan1Active = true;
    fan2Active = true;
  } else if (overrideFan1) {
    digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
    fan1Active = true;
    fan2Active = false; // Deactivate FAN2 if FAN1 override is active
  } else {
    // Control FANs based on average temperature threshold
    float averageTemperature = getAverageTemperature(temperatureC1, temperatureC2);

    if (isValidTemperature(averageTemperature)) {
      display.setCursor(0, 20);
      display.print("Temp avg: ");
      display.print(averageTemperature, 1);
      display.print(" C");

      if (averageTemperature >= 99.0 && !fan1Active) {
        digitalWrite(FAN1_PIN, HIGH); // Turn ON FAN1
        fan1Active = true;
      }

      if (averageTemperature >= 106.0 && !fan2Active) {
        digitalWrite(FAN2_PIN, HIGH); // Turn ON FAN2
        fan2Active = true;
      }

      if (averageTemperature <= 95.0) {
        digitalWrite(FAN1_PIN, LOW); // Turn OFF FAN1
        fan1Active = false;
      }

      if (averageTemperature <= 99.0) {
        digitalWrite(FAN2_PIN, LOW); // Turn OFF FAN2
        fan2Active = false;
      }
    } else {
      display.setCursor(0, 20);
      display.print("Temp avg: Invalid");
    }
  }

  // Display FAN status
  display.setCursor(0, 30);
  display.print("FAN1: ");
  display.print(fan1Active || overrideFan1 ? "ON" : "OFF");

  display.setCursor(64, 30);
  display.print("FAN2: ");
  display.print(fan2Active || overrideFan2 ? "ON" : "OFF");

  display.setCursor(0,40);
  display.print("OilP 5.53b");
  display.setCursor(64, 40);
  display.print("OilT 87 C");

  display.setCursor(45, 55);
  display.print("PRNDL21");

  // Update the display
  display.display();

  // Delay for a while
  delay(2000);
}

float getAverageTemperature(float temp1, float temp2) {
  // Calculate average temperature
  if (isValidTemperature(temp1) && isValidTemperature(temp2)) {
    return (temp1 + temp2) / 2.0;
  } else if (isValidTemperature(temp1)) {
    return temp1;
  } else if (isValidTemperature(temp2)) {
    return temp2;
  } else {
    return -127.0; // Invalid temperature
  }
}

bool isValidTemperature(float temp) {
  // Check if temperature is within a reasonable range
  return temp > -100.0 && temp < 150.0;
}

ISR(WDT_vect) {
  // Watchdog Timer interrupt service routine
  // You can add additional handling here if needed
}