Introduction: Interfacing LCD SMARTIE With Arduino
first you will need to connect LCD to ARDUINO as shown in the picture
download and setup LCD SMARTIE and specify port and baud rate to 115200.
or you can change it to what is best for your system, i found 115200 baud rate best for scrolling speed and refresh rate.
finally you can upload attached code and run LCD SMARTIE and use any plugin you want with no problems of showing garbage characters...
the code is not mine i found it on Arduino forums and edited it to work best.