diff --git a/firmware/app/main.c b/firmware/app/main.c
index 2bf7f00..bc64605 100644
--- a/firmware/app/main.c
+++ b/firmware/app/main.c
@@ -173,7 +173,8 @@ int main(void)
         }
 
         // stay a while
-        __WFI();
+        // __WFI();
+        PWR_EnterSTANDBYMode();
     }
 }
 
@@ -181,6 +182,11 @@ int main(void)
 void AWU_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
 void AWU_IRQHandler(void)
 {
+    // clear interrupt flag
+    EXTI_ClearFlag(EXTI_Line27);
+
+    // SetSysClock_HSI(HCLK_24MHZ);
+
     cnt++;
     if (cnt >= 1000) {
         cnt = 0;
@@ -196,11 +202,7 @@ void AWU_IRQHandler(void)
     matrix_send();
 
     // handle ADC
+    adc_next();
 
     // handle buttons
-
-    // do we sleep?
-
-    // clear interrupt
-    EXTI_ClearFlag(EXTI_Line27);
 }
\ No newline at end of file