diff --git a/FlippR-Driver/src/PinController.cpp b/FlippR-Driver/src/PinController.cpp
index c0761d5..84e4554 100644
--- a/FlippR-Driver/src/PinController.cpp
+++ b/FlippR-Driver/src/PinController.cpp
@@ -40,6 +40,8 @@ void PinController::initialize_output_pin(const uint8_t address)
 
 void PinController::write_pin(uint8_t address, bool value)
 {
+  std::lock_guard<std::mutex> guard(log);
+
   digitalWrite(address, value);
 }
 
diff --git a/FlippR-Driver/src/PinController.h b/FlippR-Driver/src/PinController.h
index a93b943..dfc8ffd 100644
--- a/FlippR-Driver/src/PinController.h
+++ b/FlippR-Driver/src/PinController.h
@@ -37,6 +37,8 @@ protected:
 
 public:
   static std::once_flag GPIO_LIB_INITIALIZED;
+
+  static std::mutex log;
 };
 
 }