Update temperature controller with secondary input.

TemperatureController/CHANGELOG.md

 # CHANGELOG
 
+## 1.3.1
+
+### Added
+
+* Add a secondary control Pin (to switch both outputs at the same time)
+
+
 ## 1.3.0
 
 ### Added

TemperatureController/TemperatureController.ino

@@ -4,15 +4,18 @@
  * Read sensor values and calculate a PID value from sensor 0.
  * Depending on this PID value, a control (relay, valve etc.) is switched.
  *
+ * Error is setpoint minus current value.
+ * For temperature: higher temperature is lower value. Positive P/I increases with rising temperatures.
  * An additional channel can deactivate the controller as an emergency shut off.
  ***************************
 */
 
 //**        CONSTANTS PARAMETERS  change for your application     **//
-const String version = "1.3.0"; // Version of this script. Filename is added before, date of compilation afterwards.
+const String version = "1.3.1"; // Version of this script. Filename is added before, date of compilation afterwards.
 
 const int cyclePeriod = 1; //program cycle period in s
 const int controlPin = 11; //Pin by which the control unit is controlled (11 or 12)
+const int secondaryControlPin = 12;  // Secondary Pin to control output (or -1)
 
 const int emergencyPin = -1; // Analog channel to which the emergency sensor is connected. Set to -1 to deactivate
 const int emergencyThreshold = 341; // Threshold value, when the control should be deactivated due to emergency activated
@@ -103,11 +106,11 @@ void setup()  {
   }
   EEPROM.get(1 * floatsize, PIDKp);
   if ( isnan(PIDKp)){
-    PIDKp = -1000;
+    PIDKp = 1000;
   }
   EEPROM.get(2 * floatsize, PIDKi);
   if ( isnan(PIDKi)){
-    PIDKi = -1;
+    PIDKi = 1;
   }
   EEPROM.get(3 * floatsize, integral);
   if ( isnan(integral)  || integral < 0 || integral > 1000 ){
@@ -343,5 +346,8 @@ void enable_control(const boolean enabled){
   if (digitalRead(controlPin) != enabled){
     digitalWrite(controlPin, enabled);
     digitalWrite(indicatorPin, enabled);
+    if (secondaryControlPin >= 0){
+      digitalWrite(secondaryControlPin, enabled);
+    }
   }
 }