diff --git a/main.h b/main.h
--- a/main.h
+++ b/main.h
@@ -1,6 +1,8 @@
 #ifndef __MAIN_H
 #define __MAIN_H
 
+#define STM32F042x6
+
 #include "stm32f0xx_hal_conf.h"
 
 void TimingDelay_Decrement(void);