Do you mean
- Sharewave
3.5 LCD Touchscreen or is it
- Waveshare
3.5 LCD Touchscreen ?
I have 2 Waveshare 5 Inch resistive touchscreen’s (non USB) running following this guide to install the drivers.
http://www.waveshare.com/wiki/5inch_HDMI_LCD
I suppose that for your 3.5 Inch version you could follow this guide:
