diff --git a/zh_avr_ac_dimmer.c b/zh_avr_ac_dimmer.c
index 1078858..32ec883 100644
--- a/zh_avr_ac_dimmer.c
+++ b/zh_avr_ac_dimmer.c
@@ -83,16 +83,16 @@ void zh_avr_ac_dimmer_isr_handler(void)
                 {
                 case AVR_PORTB:
                     PORTB |= (1 << _init_config.triac_gpio);
-                    _delay_us(5);
+                    _delay_us(2);
                     PORTB &= ~(1 << _init_config.triac_gpio);
                     break;
                 case AVR_PORTC:
                     PORTC |= (1 << _init_config.triac_gpio);
-                    _delay_us(5);
+                    _delay_us(2);
                     PORTC &= ~(1 << _init_config.triac_gpio);
                 case AVR_PORTD:
                     PORTD |= (1 << _init_config.triac_gpio);
-                    _delay_us(5);
+                    _delay_us(2);
                     PORTD &= ~(1 << _init_config.triac_gpio);
                     break;
                 default:
@@ -235,7 +235,6 @@ 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;
@@ -245,20 +244,21 @@ ISR(TIMER0_COMPA_vect)
         {
         case AVR_PORTB:
             PORTB |= (1 << _init_config.triac_gpio);
-            _delay_us(5);
+            _delay_us(2);
             PORTB &= ~(1 << _init_config.triac_gpio);
             break;
         case AVR_PORTC:
             PORTC |= (1 << _init_config.triac_gpio);
-            _delay_us(5);
+            _delay_us(2);
             PORTC &= ~(1 << _init_config.triac_gpio);
         case AVR_PORTD:
             PORTD |= (1 << _init_config.triac_gpio);
-            _delay_us(5);
+            _delay_us(2);
             PORTD &= ~(1 << _init_config.triac_gpio);
             break;
         default:
             break;
         }
     }
+    ++_dimmer_count;
 }
\ No newline at end of file