initial

.gitignore

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+*.swp

hot_fermentation.ino

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+#include <LiquidCrystal_I2C.h>
+#include <max6675.h>
+#include <Wire.h>
+#include <PID_v1.h>
+
+// MAX6675 configuration
+int max_SO = 12;
+int max_CS = 10;
+int max_SCK = 13;
+MAX6675 thermocouple(max_SCK, max_CS, max_SO);
+
+// LCD configuration via I2C
+LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD I2C address
+
+// SSR pin configuration
+const int ssrPin = 7;
+
+// Process phases (temperatures in Celsius and duration in minutes)
+
+// const int temperatures[] = {49, 51, 55, 45};
+// const int phaseDurations[] = {30, 30, 30, 30};  // Individual durations for each phase in minutes
+// const int numPhases = 3;
+
+
+// const int temperatures[] = {47, 55, 65, 72, 85, 0};
+// const int phaseDurations[] = {20, 20, 20, 20, 20, 5};  // Individual durations for each phase in minutes
+// const int numPhases = 5;
+
+// const int temperatures[] = {85, 50};
+// const int phaseDurations[] = {120, 120};  // Individual durations for each phase in minutes
+// const int numPhases = 1;
+
+const int temperatures[] = {47, 53, 65, 72, 90, 50};
+const int phaseDurations[] = {120, 120, 150, 60, 105, 60};  // Individual durations for each phase in minutes
+const int numPhases = 5;
+
+// const int temperatures[] = {55, 65, 72, 80, 90, 10};
+// const int phaseDurations[] = {60, 120, 120, 120, 30, 100};  // Individual durations for each phase in minutes
+// const int numPhases = 5;
+
+
+// PID Control variables
+double Setpoint, Input, Output;
+double Kp = 2, Ki = 0.5, Kd = 0.25;
+PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);
+
+// Timing variables
+unsigned long phaseStartTime;
+unsigned long totalStartTime;
+unsigned long ssrLastSwitchTime;
+const int ssrSwitchInterval = 1000;  // SSR switching interval in milliseconds
+
+void setup() {
+  pinMode(ssrPin, OUTPUT);
+  Serial.begin(9600);
+  lcd.init();
+  lcd.backlight();
+  lcd.print("Starting...");
+  delay(2000);
+  
+  // Begin the first phase
+  phaseStartTime = totalStartTime = millis();
+  Setpoint = temperatures[0];
+  myPID.SetMode(AUTOMATIC);
+  myPID.SetOutputLimits(0, 1);  // SSR is either ON or OFF
+  digitalWrite(ssrPin, HIGH); // Start with heater on
+  ssrLastSwitchTime = millis();
+}
+
+void loop() {
+  static int currentPhase = 0;
+  Input = (int) thermocouple.readCelsius(); // Cast to integer for display and control
+  unsigned long currentTime = millis();
+
+  myPID.Compute();
+  
+  // Switch SSR based on PID output and interval control
+  if (currentTime - ssrLastSwitchTime > ssrSwitchInterval) {
+    digitalWrite(ssrPin, Output > 0.5 ? HIGH : LOW);
+    ssrLastSwitchTime = currentTime;
+  }
+
+  // Display time calculations
+  unsigned long totalElapsedTime = (currentTime - totalStartTime) / 1000; // Total elapsed time in seconds
+  unsigned long totalProcessTime = 0;
+  for (int i = 0; i < numPhases; i++) {
+    totalProcessTime += phaseDurations[i] * 60;
+  }
+
+  // Check if the phase duration is complete
+  if ((currentTime - phaseStartTime) / 1000 >= phaseDurations[currentPhase] * 60) {
+    currentPhase++;
+    if (currentPhase >= numPhases) {
+      lcd.clear();
+      lcd.print("Complete");
+      digitalWrite(ssrPin, LOW); // Turn off the heater
+      return; // Stop further execution
+    }
+    phaseStartTime = currentTime; // Reset the start time for the new phase
+    Setpoint = temperatures[currentPhase];
+  }
+
+  // Display data on the LCD
+  lcd.clear();
+  lcd.setCursor(0, 0);
+  lcd.print(formatTime(totalElapsedTime));
+  lcd.print(" (");
+  lcd.print(formatTime(totalProcessTime));
+  lcd.print(")");
+
+  lcd.setCursor(0, 1);
+  lcd.print(currentPhase + 1);
+  lcd.print(". ");
+  lcd.print((int)Input);
+  lcd.print("C ");
+  lcd.print((int)Setpoint);
+  lcd.print("C ");
+  lcd.print(formatTime((phaseDurations[currentPhase] * 60) - ((currentTime - phaseStartTime) / 1000)));
+
+  delay(1000); // Update every second
+}
+
+String formatTime(long seconds) {
+  long mins = seconds / 60;
+  int secs = seconds % 60;
+  return (mins < 10 ? "0" : "") + String(mins) + ":" + (secs < 10 ? "0" : "") + String(secs);
+}