diff --git a/config.h b/config.h
--- a/config.h
+++ b/config.h
@@ -15,5 +15,7 @@
 #define SW_LEFT GPIOB, GPIO_Pin_5
 #define SW_RIGHT GPIOB, GPIO_Pin_7
 
+#define SSR_PIN GPIOC, GPIO_Pin_13
+
 
 #endif