diff --git a/io/clock.h b/io/clock.h
new file mode 100644
index 0000000..94845e9
--- /dev/null
+++ b/io/clock.h
@@ -0,0 +1,4 @@
+#pragma once
+
+#define F_CPU 16000000
+#include <util/delay.h>
diff --git a/io/io.cppproj b/io/io.cppproj
index 9772ea5..a7853c1 100644
--- a/io/io.cppproj
+++ b/io/io.cppproj
@@ -128,6 +128,9 @@
     </ToolchainSettings>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="clock.h">
+      <SubType>compile</SubType>
+    </Compile>
     <Compile Include="io\io.hpp">
       <SubType>compile</SubType>
     </Compile>
diff --git a/io/main.cpp b/io/main.cpp
index 1a8724a..3595112 100644
--- a/io/main.cpp
+++ b/io/main.cpp
@@ -1,3 +1,5 @@
+#include "clock.h"
+
 #include "io/io.hpp"
 
 int main()