Add HC SR501 PIR sensor support (#107)

ZsensorHCSR501.ino

@@ -0,0 +1,59 @@
+/*  
+  OpenMQTTGateway Addon  - ESP8266 or Arduino program for home automation 
+
+   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker 
+   Send and receiving command by MQTT
+ 
+    HC SR-501 reading Addon
+  
+    Copyright: (c)Florian ROBERT
+    
+    Contributors:
+    - 1technophile
+  
+    This file is part of OpenMQTTGateway.
+    
+    OpenMQTTGateway is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenMQTTGateway is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifdef ZsensorHCSR501
+
+void setupHCSR501() {
+  pinMode(HCSR501_PIN, INPUT);     // declare HC SR-501 pin as input
+}
+
+void MeasureHCSR501(){
+  if (millis() > TimeBeforeStartHCSR501) {//let time to init the PIR sensor
+  static int pirState = LOW;
+  int PresenceValue = digitalRead(HCSR501_PIN);
+  #ifdef ESP8266
+    yield();
+  #endif
+  if (PresenceValue == HIGH) { 
+    if (pirState == LOW) {
+     // turned on
+     client.publish(subjectHCSR501toMQTT,"true");
+      trc(F("HC SR501 Motion detected"));
+      pirState = HIGH;
+    }
+    } else {
+      if (pirState == HIGH){
+        // turned off
+        client.publish(subjectHCSR501toMQTT,"false");
+        trc(F("HC SR501 Motion ended"));
+        pirState = LOW;
+      }
+    }
+  }
+}
+#endif