Using delay instead of delayMicroseconds on DHT warmup delay

code/espurna/sensors/DHTSensor.h

@@ -137,7 +137,11 @@ class DHTSensor : public BaseSensor {
             pinMode(_gpio, OUTPUT);
             noInterrupts();
         	digitalWrite(_gpio, LOW);
-            delayMicroseconds(_type == DHT_CHIP_DHT11 ? 20000 : 500);
+            if (_type == DHT_CHIP_DHT11) {
+                delay(20);
+            } else {
+                delayMicroseconds(500);
+            }
             digitalWrite(_gpio, HIGH);
             delayMicroseconds(40);
             pinMode(_gpio, INPUT_PULLUP);