diff --git a/test.py b/test.py
index 3c4b1d4..5a66b91 100644
--- a/test.py
+++ b/test.py
@@ -1,41 +1,43 @@
-import gpiozero
 import time
+import os
 from datetime import datetime
-import RPi.GPIO as GPIO
 
-GPIO.setmode(GPIO.BCM)
+def debug_print(message: str):
+    now = datetime.now()
+    current_time = now.strftime("%H:%M:%S")
+    print('[DEBUG]['+current_time+'] '+message)
 
-GPIO.setup(19, GPIO.OUT)
-GPIO.output(19, GPIO.LOW)
-time.sleep(1)
-GPIO.output(19, GPIO.HIGH)
+def error_print(message: str):
+    now = datetime.now()
+    current_time = now.strftime("%H:%M:%S")
+    print('[ERROR]['+current_time+'] '+message)
+
+
+relay_channels = ["19", "16", "26", "20"]
+for channel in relay_channels:
+    os.system('echo "'+channel+'" /sys/class/gpio/export')
+    os.system('echo "out" > /sys/class/gpio/gpio'+channel+'/direction')
+
+
+def relay_controller(pin: int, state: str):
+    if state == "True":
+        os.system('echo "1" > /sys/class/gpio/gpio'+str(pin)+'/value')
+        debug_print("Set relay-pin "+str(pin)+" to state True")
+    elif state == "False":
+        os.system('echo "0" > /sys/class/gpio/gpio'+str(pin)+'/value')
+        debug_print("Set relay-pin "+str(pin)+" to state False")
+    else:
+        error_print("Unknown state ("+state+") for relay channel "+str(pin))
+
+channel_1 = 19
+channel_2 = 16
+channel_3 = 26
+channel_4 = 20
+
+relay_controller(channel_1, "True")
+time.sleep(2)
+relay_controller(channel_1, "False")
 time.sleep(5)
-GPIO.cleanup()
 
-# def debug_print(message: str):
-#     now = datetime.now()
-#     current_time = now.strftime("%H:%M:%S")
-#     print('[DEBUG]['+current_time+'] '+message)
-
-# def error_print(message: str):
-#     now = datetime.now()
-#     current_time = now.strftime("%H:%M:%S")
-#     print('[ERROR]['+current_time+'] '+message)
-
-# def relay_controller(pin: int, state: str):
-#     if state == "True":
-#         relay = gpiozero.OutputDevice(pin, active_high=False, initial_value=False)
-#         relay.on()
-#         debug_print("Set relay-pin "+str(pin)+" to state True")
-#     elif state == "False":
-#         relay = gpiozero.OutputDevice(pin, active_high=False, initial_value=False)
-#         relay.off()
-#         debug_print("Set relay-pin "+str(pin)+" to state False")
-#     else:
-#         error_print("Unknown state for relay ("+state+")")
-
-# while True:
-#     relay_controller(19, "True")
-#     time.sleep(2)
-#     relay_controller(19, "False")
-#     time.sleep(2)
\ No newline at end of file
+for channel in relay_channels:
+    os.system('echo "'+channel+'" > /sys/class/gpio/unexport')
\ No newline at end of file