Next, on your Visual Studio Design Form, double-click on Timer1 and enter the following code under the Private Sub Timer1_Tick event. Make sure you write the correct COM port number in your code Dim com 1 As 10.Ports. SerialPort = Nothing Light1.State = ToggleSwitch 1.State 'power ON/OFF If Light1.State = True Then 'check if the POWER is ON Try 'Insert correct COM port here (i.e. COM Port your Arduino uses) com1 = My Computer Ports OpenSerialPort("COM7") 'Set baud rate here com1.BaudRate = 9600 KARENA TAS 201 4