refactor: export functions for controlling relay

relay.py

@@ -6,17 +6,24 @@ import time
 # Config those variables
 PIN = 12
 
-def main():
-    time.sleep(5)
-    GPIO.output(PIN, GPIO.LOW)
-    time.sleep(5)
-    GPIO.output(PIN, GPIO.HIGH)
-    time.sleep(5)
-    GPIO.output(PIN, GPIO.LOW)
-    time.sleep(5)
-    GPIO.cleanup()
-
-if __name__ == '__main__':
+def setup():
     GPIO.setmode(GPIO.BOARD)
     GPIO.setup(PIN, GPIO.OUT, initial=GPIO.HIGH)
-    main()
+
+def turnOn():
+    GPIO.output(PIN, GPIO.LOW)
+
+def turnOff():
+    GPIO.output(PIN, GPIO.HIGH)
+
+def tearDown():
+    GPIO.cleanup(PIN)
+
+if __name__ == '__main__':
+    setup()
+    turnOn()
+    time.sleep(5)
+    turnOff()
+    time.sleep(5)
+    tearDown()
+