Code für Ultraschall sensor optimiert, schwankungen eliminiert

arduino/Ultrasonic_Sensor/Ultrasonic_Sensor.ino

+#define DISTANCE 15
+
 // defines pins numbers
 const int trigPin = 2;  //D4
 const int echoPin = 0;  //D3
 // defines variables
 long duration;
 int distance;
+int bool1 = 0;
 
 void setup() {
-pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
-pinMode(echoPin, INPUT); // Sets the echoPin as an Input
-Serial.begin(9600); // Starts the serial communication
+  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
+  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
+  Serial.begin(9600); // Starts the serial communication
 }
 
 void loop() {
-// Clears the trigPin
-digitalWrite(trigPin, LOW);
-delayMicroseconds(2);
+  // Clears the trigPin
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(2);
 
-// Sets the trigPin on HIGH state for 10 micro seconds
-digitalWrite(trigPin, HIGH);
-delayMicroseconds(10);
-digitalWrite(trigPin, LOW);
+  // Sets the trigPin on HIGH state for 10 micro seconds
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
 
-// Reads the echoPin, returns the sound wave travel time in microseconds
-duration = pulseIn(echoPin, HIGH);
+  // Reads the echoPin, returns the sound wave travel time in microseconds
+  duration = pulseIn(echoPin, HIGH);
 
-// Calculating the distance
-distance= duration*0.034/2;
-// Prints the distance on the Serial Monitor
-Serial.print("Distance: ");
-Serial.println(distance);
-delay(2000);
+  // Calculating the distance
+  distance = duration * 0.034 / 2;
+  // Prints the distance on the Serial Monitor
+if (bool1 == 0) {
+    //if ((distance != (DISTANCE - 1)) && (distance != (DISTANCE)) && (distance != (DISTANCE + 1))) { //+-1 
+      if(((DISTANCE+2)<distance)|| ((DISTANCE-2)>distance)){    //darf +- 2 um festgelegte entfernung schwanken, um störungen herauszufiltern
+      Serial.print("Motion detected: ");
+      Serial.println(distance);
+      bool1 = 1;
+      
+    }
+  }
+  else if(bool1==1){
+    if(((DISTANCE+2)<distance)|| ((DISTANCE-2)>distance)){    //darf +- 2 um festgelegte entfernung schwanken, um störungen herauszufiltern
+    Serial.print("Still motion detected: ");
+      Serial.println(distance);
+    }
+      else{
+        //Flag wieder auf 0
+        bool1=0;
+      }
+  }
+  delay(100);
 }
-

arduino/Ultrasonic_Sensor_optimiert/Ultrasonic_Sensor_optimiert.ino

+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+//Eigene zu trackende Entfernung festlegen
+#define DISTANCE 15
+
+const char* SSID = "smartroom";
+const char* PSK = "smarthome";
+const char* MQTT_BROKER = "192.168.4.1";
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+// defines pins numbers
+const int trigPin = 2;  //D4
+const int echoPin = 0;  //D3
+
+long duration;
+int distance;
+int bool1 = 0;
+char msg[50];
+int value = 0;
+long lastMsg = 0;
+
+void setup() {
+  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
+  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
+
+  Serial.begin(115200);
+  setup_wifi();
+  client.setServer(MQTT_BROKER, 1883);
+}
+
+void setup_wifi() {
+  delay(10);
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(SSID);
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(SSID, PSK);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void reconnect() {
+  while (!client.connected()) {
+    Serial.print("Reconnecting...");
+    if (!client.connect("ESP8266Client")) {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" retrying in 5 seconds");
+      delay(5000);
+    }
+  }
+}
+
+
+void loop() {
+
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
+
+  // Clears the trigPin
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(2);
+
+  // Sets the trigPin on HIGH state for 10 micro seconds
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+
+  // Reads the echoPin, returns the sound wave travel time in microseconds
+  duration = pulseIn(echoPin, HIGH);
+
+  // Calculating the distance
+  distance = duration * 0.034 / 2;
+  // Prints the distance on the Serial Monitor
+ /* if ((distance != (distance_alt - 1)) && (distance != (distance_alt)) && (distance != (distance_alt + 1))) { //+-1 um störungen herauszufiltern
+    snprintf (msg, 50, "%d", distance);
+    Serial.print("Publish Motion: ");
+    Serial.println(msg);
+    client.publish("/home/data", msg);
+    delay(200);
+  } */
+  if (bool1 == 0) {
+    //alternativ: if ((distance != (DISTANCE - 1)) && (distance != (DISTANCE)) && (distance != (DISTANCE + 1))) { //+-1
+    if (((DISTANCE + 2) < distance) || ((DISTANCE - 2) > distance)) { //darf +- 2 um festgelegte entfernung schwanken, um störungen herauszufiltern
+      //Meldung an PI, dass die Distanz gestört ist
+      snprintf (msg, 50, "%d", 1);
+      client.publish("/home/data", msg);
+      //Serieller Monitor
+      Serial.print("Motion detected! Distance: ");
+      Serial.println(msg);
+
+      //Flag auf 1
+      bool1 = 1;
+
+    }
+  }
+  else if (bool1 == 1) {
+    if (((DISTANCE + 2) < distance) || ((DISTANCE - 2) > distance)) { //darf +- 2 um festgelegte entfernung schwanken, um störungen herauszufiltern
+      Serial.print("Still motion detected! Distance: ");
+      Serial.println(distance);
+    }
+    else {
+      //Meldung an PI, dass die Ausgangsdistanz wieder gemessen wird
+      snprintf (msg, 50, "%d", 0);
+      client.publish("/home/data", msg);
+      
+      //Flag wieder auf 0
+      bool1 = 0;
+
+    }
+  }
+  delay(100);
+}

arduino/wlan_ultraschall/wlan_ultraschall.ino

     Serial.print("Publish Motion: ");
     Serial.println(msg);
     client.publish("/home/data", msg);
-    delay(500);
+    delay(200);
   }
   distance_alt=distance;
+
+  
 }