some code improvements

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

Taupunkt/Taupunkt.ino

@@ -1,65 +1,23 @@
-/*
-  LiquidCrystal Library - Hello World
-
- Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
- library works with all LCD displays that are compatible with the
- Hitachi HD44780 driver. There are many of them out there, and you
- can usually tell them by the 16-pin interface.
-
- This sketch prints "Hello World!" to the LCD
- and shows the time.
-
-  The circuit:
- * LCD RS pin to digital pin 12
- * LCD Enable pin to digital pin 11
- * LCD D4 pin to digital pin 5
- * LCD D5 pin to digital pin 4
- * LCD D6 pin to digital pin 3
- * LCD D7 pin to digital pin 2
- * LCD R/W pin to ground
- * LCD VSS pin to ground
- * LCD VCC pin to 5V
- * 10K resistor:
- * ends to +5V and ground
- * wiper to LCD VO pin (pin 3)
-
- Library originally added 18 Apr 2008
- by David A. Mellis
- library modified 5 Jul 2009
- by Limor Fried (http://www.ladyada.net)
- example added 9 Jul 2009
- by Tom Igoe
- modified 22 Nov 2010
- by Tom Igoe
- modified 7 Nov 2016
- by Arturo Guadalupi
-
- This example code is in the public domain.
-
- http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld
-
-*/
-
 // include the library code:
 #include <LiquidCrystal.h>
 #include <DHT22.h>
 
-int pinDHT22a = 8;
+int pinDHT22a = 7;
 DHT22 dht22a(pinDHT22a);
 int status1 = 0;
 
-int pinDHT22b = 9;
+int pinDHT22b = 6;
 DHT22 dht22b(pinDHT22b);
 int status2 = 0;
-const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
+const int rs = 13, en = 12, d4 = 11, d5 = 10, d6 = 9, d7 = 8;
 LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
 float temp1 = 0, temp2 = 0, humi1 = 0, humi2 = 0;
-float treshold = 5.0;
+float treshold = 2;
-float hyster = 1.0;
+float hyster = 1;
 float min_temp = 5;
 
-int relay = 7;
+int relay = 5;
 
 byte degree[8] = {
   0b00010,
@@ -114,6 +72,8 @@ void setup() {
   lcd.createChar(2, on); 
   lcd.createChar(3, off); 
   pinMode(relay,OUTPUT);
+  pinMode(4,OUTPUT);
+  digitalWrite(4,LOW);
   lcd.setCursor(0,0);
   lcd.print("     IN   OUT");
   
@@ -168,7 +128,7 @@ float taupunkt(float t, float r) {
   if (t >= 0) {
     a = 7.5;
     b = 237.3;
-  } else if (t < 0) {
+  } else {
     a = 7.6;
     b = 240.7;
   }