I have one years experience with arduino and easily can do usb to serial.I have good knowledge to convert idea into product.I have done a lot of research work on embedded systems in past job.I have design more than 8 PCB for different projects with filters analog, current sense,esd protection,4 layer,digital pin protection and many others.I have good knowledge of 8 bit Atmel microcontroller and 32 bit stm.