diff --git a/projects/00std_us_ranging/00std_us_ranging.c b/projects/00std_us_ranging/00std_us_ranging.c
index 09653dd2b..90992ae9f 100644
--- a/projects/00std_us_ranging/00std_us_ranging.c
+++ b/projects/00std_us_ranging/00std_us_ranging.c
@@ -20,10 +20,13 @@
  *  @brief The program starts executing here.
  */
 int main(void) {
-
+    
     while (1) {
+        __WFE();      
+        __SEV();
+        __WFE();
     }
 
     // one last instruction, doesn't do anything, it's just to have a place to put a breakpoint.
     __NOP();
-}
\ No newline at end of file
+}