working release with ds18B20

The Sensors have a unique ID and can be used in a bus configuration on one
gpo pin,
but we are using one pin/bus per sensor and only read the first sensor
on a bus to be able to change the sensors later without changing the code.

Steuerung_Truhen.ino

@@ -2,6 +2,7 @@
 
 #include <Wire.h> //Setup LCD
 #include <LiquidCrystal_I2C.h>
+LiquidCrystal_I2C lcd(0x3F,16,2); //0x3F = Adresse des Displays
 
 #include "Truhe.h"
 #include "Settings.h"
@@ -12,7 +13,7 @@ static unsigned long last_schalt_time = 0;
 
 void setup_lcd() {
   //LCD
-  lcd.begin(16, 2); //Starten des LCD, 16 Zeichen, 2 Zeilen
+  lcd.init();
   lcd.backlight(); //Beleuchtung des Displays einschalten
   lcd.blink();
   lcd.clear();
@@ -84,6 +85,10 @@ void loop() {
       else if (truhen[i].getStat() == 0) {
         lcd.print("O");
       }
+      else if (truhen[i].getStat() == 2) {
+        lcd.setCursor(8, i);
+        lcd.print("Error");
+      }
       if(truhen[i].getUpdLcd() == 0){
         lcd.setCursor(15, i);
         lcd.print(String("|"));

Truhe.cpp

@@ -1,37 +1,47 @@
 #include "Truhe.h"
-Truhe::Truhe(String name, int relay, uint8_t dhtpin): _dht(dhtpin, DHT22) {
+Truhe::Truhe(String name, int relay, uint8_t sensorpin){
   _name = name;
   _relay = relay;
-  _dhtpin = dhtpin;
+  _sensorpin = sensorpin;
+  _oneWire = OneWire(sensorpin);
+  _sensors = DallasTemperature(&_oneWire);
   
 };
 
 void Truhe::setup() {
   Serial.println("Setup " + _name);
-  Serial.println(_dhtpin);
+  Serial.println(_sensorpin);
   pinMode(_relay, OUTPUT);
   digitalWrite(_relay, HIGH);
-  pinMode(_dhtpin, INPUT);
+  pinMode(_sensorpin, INPUT);
-  _dht.begin();
+  _sensors.begin();
-  delay(2000);
 }
 
 void Truhe::mess() {
   Serial.println(String(_name) + " mess()");
-  //Serial.print("Minimum Sampling Period: "); 
+  _sensors.requestTemperatures();
-  //delay(_dht.getMinimumSamplingPeriod());
+  _cur_temp = _sensors.getTempCByIndex(0);
-  _cur_temp = _dht.readTemperature();
+  // Check if reading was successful
+  if(_cur_temp != DEVICE_DISCONNECTED_C) 
+  {
     Serial.println(String(_name) + "\t\t" + String((int)_cur_temp) + " grad gelesen");
+  } 
+  else
+  {
+    Serial.println("Error: Could not read temperature data: "+ String(_name));
+    _cur_temp = 99; // Liewer warmes bier als garkenn bier
+    _stat = 2;
+  }
 };
 
 void Truhe::schalt(int oT, int uT) {
   Serial.print(String(_name) + " schalt() stat: " + String(_stat));
-  if (_cur_temp >= oT && _stat != 1) {
+  if (_cur_temp >= oT && _stat != 1 && _stat != 2) {
     digitalWrite(_relay, LOW);
     _stat = 1;
     Serial.println("schalt " + _name + " zu " + String(_stat));
   }
-  else if (_cur_temp <= uT && _stat != 0) {
+  else if (_cur_temp <= uT && _stat != 0 && _stat != 2) {
     digitalWrite(_relay, HIGH);
     _stat = 0;
     Serial.println("schalt " + _name + " zu " + String(_stat));
@@ -40,7 +50,7 @@ void Truhe::schalt(int oT, int uT) {
 int Truhe::getUpdLcd(){ return _updlcd;};
 void Truhe::setUpdLcd(int updlcd){ _updlcd = updlcd;};
 int Truhe::getRelay(){ return _relay;};
-int Truhe::getDhtPin(){return _dhtpin;};
+int Truhe::getSensorPin(){return _sensorpin;};
 int Truhe::getStat(){return _stat;};
-float Truhe::getCurTemp(){return _cur_temp;};
+int Truhe::getCurTemp(){return int(_cur_temp);};
 String Truhe::getName(){return _name;};

Truhe.h

@@ -1,9 +1,11 @@
-#include <DHT.h>
+#include <OneWire.h>
+#include <DallasTemperature.h>
 class Truhe {
   private:
-    DHT _dht;
+    OneWire _oneWire;
+    DallasTemperature _sensors;
     int _relay;
-    uint8_t _dhtpin;
+    uint8_t _sensorpin;
     int _stat = -1;
     float _cur_temp = 0;
     int _updlcd = 0;
@@ -16,8 +18,8 @@ class Truhe {
     int getUpdLcd();
     void setUpdLcd(int);
     int getRelay();
-    int getDhtPin();
+    int getSensorPin();
     int getStat();
-    float getCurTemp();
+    int getCurTemp();
     String getName();
 };