diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3960c47..b4a5362 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,7 @@ target_link_libraries(sint-gauntlet
         hardware_interp
         hardware_timer
         hardware_clocks
+        hardware_pwm
         )
 
 pico_add_extra_outputs(sint-gauntlet)
diff --git a/macro.h b/macro.h
new file mode 100644
index 0000000..8bdd8db
--- /dev/null
+++ b/macro.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define ARRAY_LENGTH(array) sizeof(array) / sizeof(*array);
\ No newline at end of file