Added arduino com port to config file. Removed log spam

src/psu_device.py

@@ -13,7 +13,6 @@ class PSUDevice(ABC):
 
     def __init__(self, com_port):
         """PSUDevice assumes a serial connection"""
-        ui_print("\nConnecting to power supply...")
         self.com_port = com_port
         self.cached_state = dict.fromkeys(self.valid_channels())  # Used for components that require state on demand