Avoid spam of buffer message in hcsr501 (#442)

* Avoid printing the buffer message on every iteration of the main loop

* Print message when the motion starts (to match the motion end one)

main/ZsensorHCSR501.ino

@@ -36,7 +36,6 @@ void setupHCSR501() {
 
 void MeasureHCSR501(){
   if (millis() > TimeBeforeStartHCSR501) {//let time to init the PIR sensor
-  trc(F("Creating HCSR501 buffer"));
     const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
     StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
   JsonObject& HCSR501data = jsonBuffer.createObject();
@@ -49,6 +48,7 @@ void MeasureHCSR501(){
     if (pirState == LOW) {
       //turned on
       HCSR501data.set("hcsr501", "true");
+      trc(F("HC SR501 Motion started"));
       pirState = HIGH;
     }
     } else {