Koos van der Wat / Mbed 2 deprecated DPTimer_NormalScreen_8R_DIP_4-20mA_Out

Dryer timer with dew point control and 4-20mA analogue output signal

Dependencies:   mbed HYT Watchdog TextLCD Millis

Files at this revision

API Documentation at this revision

Revision 4:6c83f83dde87, committed 2021-01-23

Comitter:
koosvanderwat
Date:
Sat Jan 23 08:10:58 2021 +0000
Parent:
3:bbd271c944a0
Commit message:
Update to analogue out

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r bbd271c944a0 -r 6c83f83dde87 main.cpp
--- a/main.cpp	Fri Nov 29 10:06:55 2019 +0000
+++ b/main.cpp	Sat Jan 23 08:10:58 2021 +0000
@@ -125,21 +125,48 @@
 
             SENSOR.MRCommand();
             wait_ms(100);
-            SENSOR.DFCommand();
+            //SENSOR.DFCommand();
+            
+            CheckSensor = SENSOR.DFCommand();
             RHValue = (SENSOR.humidity);
             TempValue = (SENSOR.temperature);
 
-            if(RHValue < 1) {
-                sensorbroken = 1;
-            }
+            sensorbroken = 0;
+            
+            if(CheckSensor != 0){
+            sensorbroken = 1;
+            }  
+
+            //if(RHValue < 0.01) {
+            //    sensorbroken = 1;
+            //}
 
             if(TempValue < -20) {
                 sensorbroken = 1;
             }
 
             if(sensorbroken == 0) {
+               RHValue = (SENSOR.humidity);
+               TempValue = (SENSOR.temperature);
+               
+               if (RHValue != 0){
+               
                 A = log( RHValue * 0.01 * pow(10, 7.5*TempValue/(237.2+TempValue) )  );
                 DewPoint = (23720 * A/(17.269-A))/100;
+                }
+                
+                if (RHValue == 0){
+                    DewPoint = -50;
+                    }
+                
+                if(DewPoint > 20){
+                    DewPoint = 20;
+                    }
+                    
+                    if(DewPoint < -50){
+                    DewPoint = -50;
+                    }
+            
 
                 if (ClimateControl == 1) {
                     NewSetPoint = TempValue - DewPointSuppresion;
@@ -168,7 +195,9 @@
                 lcd.locate(11,1);
                 lcd.printf("%.1f%", TempValue);
                 
-                DP_Out = 0.0104*DewPoint + 0.702;
+                DP_Out = 0.0104*DewPoint + 0.702; // For dewpoint -50 to 20 with output signal 0.6V to 3V
+                //DP_Out = 0.0143*DewPoint + 0.714;
+                
                 
                 if ((DewPoint <  NewSetPoint)  && (secondscounter == LHCT)) {
                     secondscounter = secondscounter - 1;