USB CH340 relay

(Connect one end of the cable to NO port and the other to COM port).

Linux

1. Plug it and check if it's recognized: lsusb

2. Get /dev/ttyUSBx path: dmesg | grep tty

3. Write permissions:

   To give persistent access permissions to (for example) /dev/ttyUSB0 to your user you have to find out the gid of /dev/ttyUSB0 by doing: stat /dev/ttyUSB0 and then add your user to that group with: sudo gpasswd -a USER group

   (Exit and login to reload your user's permissions).

4. Run:

   chmod +x ./relay_on.sh

   chmod +x ./relay_off.sh

   ON -> ./relay_on.sh

   OFF -> ./relay_off.sh

Windows

Just run Powershell scripts.