first working version

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

Taupunkt/Taupunkt.ino

@@ -44,21 +44,22 @@
 #include <LiquidCrystal.h>
 #include <DHT22.h>
 
-int pinDHT22a = A1;
+int pinDHT22a = 8;
 DHT22 dht22a(pinDHT22a);
 int status1 = 0;
 
-int pinDHT22b = A0;
+int pinDHT22b = 9;
 DHT22 dht22b(pinDHT22b);
 int status2 = 0;
-
 const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
 LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
-double sum_diff_temp = 0;
-double sum_diff_humi = 0;
 float temp1 = 0, temp2 = 0, humi1 = 0, humi2 = 0;
-long count = 0;
+float treshold = 5.0;
+float hyster = 1.0;
+float min_temp = 5;
+
+int relay = 7;
 
 byte degree[8] = {
   0b00010,
@@ -82,28 +83,82 @@ byte tau[8] = {
   0b00000
 };
 
+byte on[8] = {
+  0b11111,
+  0b10001,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b10001,
+  0b11111
+};
+
+byte off[8] = {
+  0b11111,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b11111
+};
+
 
 void setup() {
   // set up the LCD's number of columns and rows:
   lcd.begin(16, 4);
   lcd.createChar(0, degree); 
   lcd.createChar(1, tau); 
-  // Print a message to the LCD.
-  pinMode(6,OUTPUT);
-  digitalWrite(6,LOW);
- 
+  lcd.createChar(2, on); 
+  lcd.createChar(3, off); 
+  pinMode(relay,OUTPUT);
   lcd.setCursor(0,0);
-  lcd.print("Initializing...");
+  lcd.print("     IN   OUT");
+  
+  lcd.setCursor(0,1);
+  lcd.print("Temp   .    . ");
+  lcd.write((int)0);
+  lcd.print("C");
+  
+  lcd.setCursor(0,2);
+  lcd.print("Humi   .    .  %");
+  
+  lcd.setCursor(0,3);
+  lcd.print("   ");
+  lcd.write((int)1);
+  lcd.print("   .    . ");
+  lcd.write((int)0);
+  lcd.print("C");
+}
+
+void printVal(float v){
+  if (v<10) lcd.print(" ");
+  lcd.print(v,1);
 }
 
 void relayOff(){
-  
+  lcd.setCursor(0,0);
+  lcd.print("OFF");
+  digitalWrite(relay,LOW);
+}
+
+void relayOn(){
+  lcd.setCursor(0,0);
+  lcd.print("ON ");
+  digitalWrite(relay,HIGH);
 }
 
-void fehler(String tx){
-    lcd.setCursor(0,2);
-    lcd.print(tx);
-    lcd.print(" failed!");
+void fehler(int col, int code){
+    lcd.setCursor(col,1);    
+    lcd.print("Err ");    
+    lcd.setCursor(col,2);
+    lcd.print("  ");
+    lcd.print(code);
+    lcd.print(" ");
+    lcd.setCursor(col,3);  
+    lcd.print("--- ");
     relayOff();
 }
 
@@ -140,69 +195,77 @@ void loop() {
   humi2  = dht22b.getHumidity();
   status2 = dht22b.getLastError();
   
-  lcd.setCursor(0, 0);  
+  boolean err1 = false;
+  boolean err2 = false;
   if (status1 != dht22a.OK || isnan(temp1)||isnan(humi1)) {    
-    lcd.print("Sensor 1");    
-    lcd.setCursor(0,1);
-    lcd.print("Error: ");
-    lcd.print(status1);
-    temp1 = 0;
-  } else {
-    lcd.print(temp1);
-    lcd.write((int)0);
-    lcd.print("C  ");
-    lcd.setCursor(0,1);
-    lcd.print(humi1);
-    lcd.print(" %  ");
+    fehler(5,status1);
+    err1 = true;
+  } else {    
+    if (temp1<-40 || temp1>80){
+      lcd.setCursor(5,1);    
+      lcd.print("oor!");
+      err1 = true;
+    } else {
+      lcd.setCursor(5,1);    
+      printVal(temp1);      
+    }
+    if (humi1<0 || humi1>100){
+      lcd.setCursor(5,2);    
+      lcd.print("oor!");
+      err1 = true;
+    } else {
+      lcd.setCursor(5,2);
+      printVal(humi1);
+    }
   }
-  
-  lcd.setCursor(9, 0);
+
   if (status2 != dht22b.OK) {    
-    lcd.setCursor(8, 0);
-    lcd.print("Sensor 2");    
-    lcd.setCursor(8,1);
-    lcd.print(status2);
-    temp2 = 0;
-  } else {  
-    lcd.setCursor(9, 0);
-    lcd.print(temp2);
-    lcd.write((int)0);
-    lcd.print("C");
-    lcd.setCursor(9,1);
-    lcd.print(humi2);
-    lcd.print(" %");
+    fehler(10,status2);
+    err2 = true;
+  } else {    
+    if (temp2<-40 || temp2>80){
+      lcd.setCursor(10,1);    
+      lcd.print("oor!");
+      err2 = true;
+    } else {
+      lcd.setCursor(10,1);    
+      printVal(temp2);      
+    }
+    if (humi2<0 || humi2>100){
+      lcd.setCursor(10,2);    
+      lcd.print("oor!");
+      err2 = true;
+    } else {
+      lcd.setCursor(10,2);
+      printVal(humi2);
+    }
   }  
 
-  if (humi1<0 || humi1>100){
-    fehler("Humi 1");
-    return;
-  }
-  if (temp1<-40 || temp1>80){
-    fehler("Temp 1");
-    return;
-  }
-  if (humi2<0 || humi2>100){
-    fehler("Humi 2");
-    return;
-  }
-  if (temp2<-40 || temp2>80){
-    fehler("Temp 2");
-    return;
-  }
-  if (status1 == dht22a.OK && status2 == dht22b.OK){
-    float tau1 = taupunkt(temp1,humi1);
-    float tau2 = taupunkt(temp2,humi2);
-    lcd.setCursor(0,2);
-    lcd.write((int)1);
-    lcd.print("1: ");
-    lcd.print(tau1);
-    lcd.setCursor(0,3);
-    lcd.write((int)1);
-    lcd.print("2: ");
-    lcd.print(tau2);
+  lcd.setCursor(5,3);    
+  float tau1, tau2;
+  if (err1){
+    lcd.print("----");
+  } else {
+    tau1 = taupunkt(temp1,humi1);    
+    printVal(tau1);
   }
 
- 
+  lcd.setCursor(10,3); 
+  if (err2){
+    lcd.print("----");
+  } else {
+    tau2 = taupunkt(temp2,humi2);    
+    printVal(tau2);    
+  }  
 
-  
+  if (err1 || err2){
+    relayOff();
+  } else {
+    if (tau1 > tau2 + treshold + hyster) {
+      relayOn();
+    } 
+    if (tau1 < tau2 + treshold) {
+      relayOff();
+    }
+  }
 }