diff --git a/main.py b/main.py
index 618831a..ed50bc6 100644
--- a/main.py
+++ b/main.py
@@ -13,23 +13,6 @@ except ImportError:
     print(ImportError)
     exit()
 
-RELAY_PIN_CH_1 = 4
-RELAY_PIN_CH_2 = 17
-RELAY_PIN_CH_3 = 27
-RELAY_PIN_CH_4 = 11
-
-global relay_ch_1
-relay_ch_1 = gpiozero.OutputDevice(RELAY_PIN_CH_1, active_high=True, initial_value=False)
-
-# global relay_ch_2
-# relay_ch_2 = gpiozero.OutputDevice(RELAY_PIN_CH_2, active_high=True, initial_value=False)
-
-# global relay_ch_3
-# relay_ch_3 = gpiozero.OutputDevice(RELAY_PIN_CH_3, active_high=True, initial_value=False)
-
-# global relay_ch_4
-# relay_ch_4 = gpiozero.OutputDevice(RELAY_PIN_CH_4, active_high=True, initial_value=False)
-
 def debug_print(message: str):
     now = datetime.now()
     current_time = now.strftime("%H:%M:%S")
@@ -41,15 +24,15 @@ def error_print(message: str):
     print('[ERROR]['+current_time+'] '+message)
 
 #relay
-def relay_controller(pin: int, status: str):
-    if status == "ON":
+def relay_controller(pin: int, state: str):
+    if state == True:
         relay = gpiozero.OutputDevice(pin, active_high=False, initial_value=False)
         relay.on()
-    elif status == "OFF":
+    elif state == False:
         relay = gpiozero.OutputDevice(pin, active_high=False, initial_value=False)
         relay.off()
     else:
-        error_print("Unknown status for relay ("+status+")")
+        error_print("Unknown state for relay ("+state+")")
 
 #ultrasonic