minor improvements

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

Taupunkt/Taupunkt.ino

@@ -3,9 +3,10 @@
 // load library for DHT22 sensor
 #include <DHT22.h>
 
-#define TRESHOLD   2
+#define TRESHOLD   1
 #define HYSTERESIS 1   
 #define MIN_OUT_TEMP 5 // °C
+#define ALLOWED_HUMIDITY 50 // %
 
 #define RELAY_PIN 5
 
@@ -79,15 +80,7 @@ byte off[8] = {
   0b11111
 };
 
-
-void setup() {
-  // set up the LCD
-  lcd.begin(16, 4);
-  lcd.createChar(0, degree); 
-  lcd.createChar(1, tau); 
-  lcd.createChar(2, on); 
-  lcd.createChar(3, off); 
-
+void table(){
     // prepare "table" on LCD
   lcd.setCursor(0,0);
   lcd.print("     IN   OUT");
@@ -106,7 +99,17 @@ void setup() {
   lcd.print("   .    . ");
   lcd.write((int)0);
   lcd.print("C");
+}
+
+void setup() {
+  // set up the LCD
+  lcd.begin(16, 4);
+  lcd.createChar(0, degree); 
+  lcd.createChar(1, tau); 
+  lcd.createChar(2, on); 
+  lcd.createChar(3, off); 
 
+  table();
 
   // set up the relay
   pinMode(RELAY_PIN,OUTPUT);
@@ -177,6 +180,8 @@ void loop() {
   outside_temp  = dht22outside.getTemperature();
   outside_humi  = dht22outside.getHumidity();
   outside_state = dht22outside.getLastError();
+  int secs = millis()/1000;
+  if (secs % 3600 < 3) table();
   
   boolean inside_error = false, outside_error = false;
   
@@ -244,7 +249,7 @@ void loop() {
   if (inside_error || outside_error || outside_temp < MIN_OUT_TEMP){
     relayOff();
   } else {
-    if (tau_inside > tau_outside + TRESHOLD + HYSTERESIS) {
+    if (inside_humi > ALLOWED_HUMIDITY && tau_inside > tau_outside + TRESHOLD + HYSTERESIS) {
       relayOn();
     } 
     if (tau_inside < tau_outside + TRESHOLD) {