firmware/weckkubator/weckkubator.ino

@@ -16,16 +16,17 @@ DallasTemperature sensors(&oneWire);  // declare sensors
 double pidset, watertemp, output;
 
 // PID adjustment
-double Kp=500, Ki=10, Kd=0;
+double Kp=2, Ki=5, Kd=1;
 PID myPID(&watertemp, &output, &pidset, Kp, Ki, Kd, DIRECT);
 int WindowSize = 5000;
 unsigned long windowStartTime;
 
 // Temp adjustment
-float tempset;
+int tempset;
 int poti;
 
 // time
+int onesecond = 1000;
 unsigned long previousMillis;
 
 
@@ -66,26 +67,7 @@ void setup() {
   lcd.print("Weckkubator 0.0.1");
   delay(3000);
   lcd.clear();
-
-  // Setup LCD
-  // Output temperatureset
-  lcd.setCursor(0, 1);
-  lcd.print("set:    ");
-  lcd.print(pidset);
-  lcd.write((byte)0);
-
-  // Output watertemp
-  lcd.setCursor(0, 2);
-  lcd.print("temp:   ");
-  lcd.print(watertemp);
-  lcd.write((byte)0);
-  lcd.print("C");
-
-  // output PID
-  lcd.setCursor (0, 3);
-  lcd.print("output: ");
-  lcd.print(output);
-
+  
 }
 
 void loop() {
@@ -95,13 +77,11 @@ void loop() {
 
   // update LCD
   unsigned long currentMillis = millis();
-  if (currentMillis - previousMillis >= 250) {
+  if (currentMillis - previousMillis >= onesecond) {
     settemp();
     readtemp();
     lcdoutput();
-    previousMillis = currentMillis;
   }
-  
 }
 
 //------------------------------------------
@@ -109,7 +89,10 @@ void loop() {
 void pid() {
 
   myPID.Compute();
-  
+
+  /************************************************
+   * turn the output pin on/off based on pid output
+   ************************************************/
   if (millis() - windowStartTime > WindowSize)
   { //time to shift the Relay Window
     windowStartTime += WindowSize;
@@ -134,20 +117,23 @@ void readtemp() {
 // LCD output
 void lcdoutput() {
   // Output temperatureset
-  lcd.setCursor(8, 1);
-  lcd.print(pidset);
+  lcd.setCursor(0, 1);
+  lcd.print("set: ");
+  lcd.print(tempset);
   lcd.write((byte)0);
   lcd.print("C");
 
   // Output watertemp
-  lcd.setCursor(8, 2);
+  lcd.setCursor(0, 2);
+  lcd.print("temp: ");
   lcd.print(watertemp);
   lcd.write((byte)0);
   lcd.print("C");
   lcd.print("   ");
 
   // output PID
-  lcd.setCursor (8, 3);
+  lcd.setCursor (0, 3);
+  lcd.print("output: ");
   lcd.print(output);
   lcd.print("   ");
 
@@ -158,15 +144,6 @@ void lcdoutput() {
 // Read Poti
 void settemp() {
   poti = analogRead(A3);
-  tempset = (20+(poti*0.04));
-
-  if (tempset <= 50) {
-    pidset = tempset;
-  }
-
-  if (tempset >= 51) {
-    pidset = (tempset+30);
-  }
-
-  
+  tempset = (18+(poti*0.07));  // range between 18°C and 18+1024*0,07 (~89°C)
+  pidset = tempset;
 }