diff --git a/zh_avr_ac_dimmer.c b/zh_avr_ac_dimmer.c
index 2f0122b..a11fd76 100644
--- a/zh_avr_ac_dimmer.c
+++ b/zh_avr_ac_dimmer.c
@@ -1,5 +1,5 @@
 #include "zh_avr_ac_dimmer.h"
-
+// https://avr-start.ru/?p=3983
 static zh_avr_ac_dimmer_init_config_t _init_config = {0};
 volatile static bool _is_dimmer_work = false;
 volatile static uint8_t _dimmer_value = 0;
@@ -48,27 +48,28 @@ avr_err_t zh_avr_ac_dimmer_set(uint8_t value)
 
 void zh_avr_ac_dimmer_isr_handler(void)
 {
-    uint8_t flag = false;
+    bool flag = false;
     switch (_init_config.zero_cross_port)
     {
     case AVR_PORTB:
-        if ((PINB & (1 << _init_config.zero_cross_gpio)) == 0)
+        if ((PINB & (1 << _init_config.zero_cross_gpio)) == (1 << _init_config.zero_cross_gpio))
         {
             flag = true;
         }
         break;
     case AVR_PORTC:
-        if ((PINC & (1 << _init_config.zero_cross_gpio)) == 0)
+        if ((PINC & (1 << _init_config.zero_cross_gpio)) == (1 << _init_config.zero_cross_gpio))
         {
             flag = true;
         }
         break;
     case AVR_PORTD:
-        if ((PIND & (1 << _init_config.zero_cross_gpio)) == 0)
+        if ((PIND & (1 << _init_config.zero_cross_gpio)) == (1 << _init_config.zero_cross_gpio))
         {
             flag = true;
         }
         break;
+
     default:
         break;
     }
@@ -101,9 +102,11 @@ void zh_avr_ac_dimmer_isr_handler(void)
             }
             else
             {
+                cli();
                 TCNT0 = 0;
-                TIFR0 = (1 << OCF0A);
+                // TIFR0 = (1 << OCF0A);
                 TIMSK0 |= (1 << OCIE0A);
+                sei();
             }
         }
     }
@@ -235,6 +238,7 @@ static avr_err_t _zh_avr_ac_dimmer_timer_init(void)
 
 ISR(TIMER0_COMPA_vect)
 {
+    ++_dimmer_count;
     if (_dimmer_count >= (100 - _dimmer_value))
     {
         _dimmer_count = 0;
@@ -259,5 +263,5 @@ ISR(TIMER0_COMPA_vect)
             break;
         }
     }
-    ++_dimmer_count;
+    // ++_dimmer_count;
 }
\ No newline at end of file