diff --git a/OpenVR/samples/driver_arduinohmd/driver_arduinohmd.cpp b/OpenVR/samples/driver_arduinohmd/driver_arduinohmd.cpp
index de9428e..5929501 100644
--- a/OpenVR/samples/driver_arduinohmd/driver_arduinohmd.cpp
+++ b/OpenVR/samples/driver_arduinohmd/driver_arduinohmd.cpp
@@ -175,6 +175,8 @@ void ArduinoIMURead()
 					HMDInitCentring = true;
 				}
 		}
+
+		if (bytesRead == 0) Sleep(1);
 	}
 }
 
@@ -505,7 +507,7 @@ class CDeviceDriver : public vr::ITrackedDeviceServerDriver, public vr::IVRDispl
 			}
 
 			// Centering
-			if ((GetAsyncKeyState(m_centeringKey) & 0x8000) != 0 || ((GetAsyncKeyState(VK_CONTROL) & 0x8000) != 0 && (GetAsyncKeyState(VK_MENU) & 0x8000) != 0 && (GetAsyncKeyState('R') & 0x8000) != 0))
+			if ( (GetAsyncKeyState(m_centeringKey) & 0x8000) != 0 || ( (GetAsyncKeyState(VK_CONTROL) & 0x8000) != 0 && (GetAsyncKeyState(VK_MENU) & 0x8000) != 0 && (GetAsyncKeyState('R') & 0x8000) != 0) )
 				SetCentering();
 
 			// Set head tracking rotation