diff --git a/main.py b/main.py
index b845500..ccce1b7 100644
--- a/main.py
+++ b/main.py
@@ -13,6 +13,22 @@ 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()
@@ -84,13 +100,25 @@ def mqtt_on_message(client, userdata, msg):
     payload = str(msg.payload.decode("utf-8"))
 
     if topic == "strawberry-pi-greenhouse/relay/channel/1":
-        pass
+        if payload == "on":
+            pass
+        elif payload == "off":
+            pass
     elif topic == "strawberry-pi-greenhouse/relay/channel/2":
-        pass
+        if payload == "on":
+            pass
+        elif payload == "off":
+            pass
     elif topic == "strawberry-pi-greenhouse/relay/channel/3":
-        pass
+        if payload == "on":
+            pass
+        elif payload == "off":
+            pass
     elif topic == "strawberry-pi-greenhouse/relay/channel/4":
-        pass
+        if payload == "on":
+            pass
+        elif payload == "off":
+            pass
 
 
 if __name__ == "__main__":