Add support for HC-SR04 sensor (#453)

Adds support for HC-SR04 Ultrasonic distance snsor.

main/config_HCSR04.h

@@ -0,0 +1,62 @@
+/*  
+  OpenMQTTGateway  - 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
+ 
+   This files enables to set your parameter for the HCSR04 sensor
+
+    Copyright: (c) mpember
+    
+    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/>.
+
+   Connection Schemata:
+   --------------------
+
+   HC-SR04 ------> Arduino Uno ----------> ESP8266
+   ==============================================
+   Vcc ---------> 5V -------------------> Vu (5V)
+   GND ---------> GND ------------------> GND
+   TRI ---------> Pin D6 ---------------> D6
+   ECH ---------> Pin D7 ---------------> D7
+   
+*/
+#ifndef config_HCSR04_h
+#define config_HCSR04_h
+
+extern void setupHCSR04();
+extern void MeasureDistance();
+
+#define HCSR04_always true // If false, the current value of the parameter is the same as previous one don't send it by MQTT
+#define TimeBetweenReadingHCSR04 5000
+
+/*----------------------------USER PARAMETERS-----------------------------*/
+/*-------------DEFINE YOUR MQTT PARAMETERS BELOW----------------*/
+#define subjectHCSR04   Base_Topic Gateway_Name "/DISTtoMQTT/sr04"
+
+/*-------------------PIN DEFINITIONS----------------------*/
+#if defined(ESP8266)
+  #define HCSR04_TRI_PIN D6
+  #define HCSR04_ECH_PIN D7
+#elif defined(ESP32)
+  #define HCSR04_TRI_PIN 16 // NOT TESTED
+  #define HCSR04_ECH_PIN 17 // NOT TESTED
+#else
+  #define HCSR04_TRI_PIN 6 // NOT TESTED
+  #define HCSR04_ECH_PIN 5 // NOT TESTED
+#endif
+
+#endif