Resume computer from stand-by through serial port

[Tyler Wiebe]

Okay, I'm wondering how I would go about waking my computer from stand-by mode from pushing a button that is connected to a serial port cts line. Anyone know how?

Currently, I have it so that if I let go of the button, it'll go into stand-by mode in 5 seconds, I need it so that when I push the button, it'll resume like when you push a button on the keyboard.

    public partial class Form1 : Form
    {
        public static Thread newThread = new Thread(new System.Threading.ThreadStart(_Activate));
        public Form1()
        {
            InitializeComponent();
            if (serialPort1.IsOpen)
            {
                button1.Text = "Close";
            }
            else if (!serialPort1.IsOpen)
            {
                button1.Text = "Open";
            }
        }
 
        public static void _Activate()
        {
            Thread.Sleep(5000);
            Application.SetSuspendState(PowerState.Suspend, false, false);
        }
 
        public void serialPort1_PinChanged(object sender, System.IO.Ports.SerialPinChangedEventArgs e)
        {
            if (!serialPort1.CtsHolding)
            {
                if (!newThread.IsAlive)
                {
                    try
                    {
                        newThread.Start();
                        BackColor = Color.Green;
                    }
                    catch
                    {
                        newThread = new Thread(new System.Threading.ThreadStart(_Activate));
                        newThread.Start();
                    }
                }
            }
            else if (serialPort1.CtsHolding)
            {
                if (newThread.IsAlive)
                {
                    newThread.Abort();
                }
            }
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            if (!serialPort1.IsOpen)
            {
                serialPort1.Open();
                button1.Text = "Close";
            }
            else if (serialPort1.IsOpen)
            {
                serialPort1.Close();
                button1.Text = "Open";
            }
        }
    }
 

[Plater]

I think you need to look at the power settings of the computer, and find the option that is something like "allow this device to wake the computer"

[Tyler Wiebe]

I checked and there is no option or power management tab for that device, it's a USB to Serial Port Adapter, and I checked all of the USB ports power management, and all there is, is a checked "Allow the computer to turn of this device to save power", and a darkened, non-checked "Allow this device to wake the computer".

And one last detail I forgot is that if I can get this working, I plan to install a sensor in my chair, so when I sit down, it'll wake up, and after 5 minutes of being of the chair, my computer will go in to stand-by mode.

[Plater]

Hmm if you dont have the option to wake it up, I don't think you can do it. PRetty sure no code runs while sleeping (except basic hardware io)

[Tyler Wiebe]

Okay thanks anyway, the best I could do was make a wait-able timer that would wake the computer up after a certain amount of time.