ECG amplifier board and PCB in altium designer format USB Interface, PIC18F4550 Microcontroller, Right-Leg Drive Circuit and Ready for Optical Isolation. Operates with 2 x 9 V batteries. Important: Do not use this circuit with any other DC or A

采用PIC18F4550编写USB下位机程序，上位机采用VB编写，实现对USB的示波器-Prepared using PIC18F4550-bit machine, under USB program, host computer using VB to prepare and realize USB Oscilloscope

example for usb interface in C18, it was compiler with MPLAB & C18 C compiler. Based on device: PIC18F2550 & PIC18F4550