commit 76eff37d926acd5603a0b5db030528b3dcfe7040
Author: Stephan Richter <s.richter@srsoftware.de>
Date:   Mon Jul 8 15:20:41 2024 +0200

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

diff --git a/Taupunkt/Taupunkt.ino b/Taupunkt/Taupunkt.ino
new file mode 100644
index 0000000..90fb17d
--- /dev/null
+++ b/Taupunkt/Taupunkt.ino
@@ -0,0 +1,208 @@
+/*
+  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 = A1;
+DHT22 dht22a(pinDHT22a);
+int status1 = 0;
+
+int pinDHT22b = A0;
+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;
+
+byte degree[8] = {
+  0b00010,
+  0b00101,
+  0b00010,
+  0b00000,
+  0b00000,
+  0b00000,
+  0b00000,
+  0b00000
+};
+
+byte tau[8] = {
+  0b00000,
+  0b00000,
+  0b11110,
+  0b01000,
+  0b01000,
+  0b01001,
+  0b00110,
+  0b00000
+};
+
+
+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.setCursor(0,0);
+  lcd.print("Initializing...");
+}
+
+void relayOff(){
+  
+}
+
+void fehler(String tx){
+    lcd.setCursor(0,2);
+    lcd.print(tx);
+    lcd.print(" failed!");
+    relayOff();
+}
+
+float taupunkt(float t, float r) {  
+  float a, b;
+  
+  if (t >= 0) {
+    a = 7.5;
+    b = 237.3;
+  } else if (t < 0) {
+    a = 7.6;
+    b = 240.7;
+  }
+  
+  // Sättigungsdampfdruck in hPa
+  float sdd = 6.1078 * pow(10, (a*t)/(b+t));
+  
+  // Dampfdruck in hPa
+  float dd = sdd * (r/100);
+  
+  // v-Parameter
+  float v = log10(dd/6.1078);
+  
+  // Taupunkttemperatur (°C)
+  return  (b*v) / (a-v);
+}
+
+void loop() {  
+  delay(2500);  
+  temp1  = dht22a.getTemperature();
+  humi1  = dht22a.getHumidity();
+  status1 = dht22a.getLastError();
+  temp2  = dht22b.getTemperature();
+  humi2  = dht22b.getHumidity();
+  status2 = dht22b.getLastError();
+  
+  lcd.setCursor(0, 0);  
+  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(" %  ");
+  }
+  
+  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(" %");
+  }  
+
+  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);
+  }
+
+ 
+
+  
+}