diff --git a/avr/timer.asm b/avr/timer.asm
index ad5b73b..9e080cf 100644
--- a/avr/timer.asm
+++ b/avr/timer.asm
@@ -132,11 +132,20 @@ Timer_Run_check1m:
   lds r16, timerModuleCounter1m
   inc r16
   sts timerModuleCounter1m, r16
+  cpi r16, 30                     ; check for every 30s
+  brne Timer_Run_l4
+  push r16
+    push r17
+      rcall onEvery30s
+    pop r17
+  pop r16
+Timer_Run_l4:
   cpi r16, 60
   brcs Timer_Run_l2
   clr r16
   sts timerModuleCounter1m, r16
   push r17
+    rcall onEvery30s
     rcall onEveryMinute
   pop r17