HID WITH ANALOUE INPUTS AND DIGITL OUTPUTS
Using PIC18F2550 for connecting analogue
and digital signals to USB port . Included Visual Basic 6 code, VS2005 C++ and C# codes are based on Microchip code, PIC ASM code, PIC C code and a circuit diagram. The PIC microcontroller
has 10 bit analogue to digital converter. The circuit is powered
by the USB. The interface to the PC is HID class.
The inputs and outputs are updated every 10ms.
HID class (human interface device) is a class of
devices like the mouse and the keyboard, the data transfer rate
is limited to 64KB/S. The PC already has a driver for HID USB.
VB6 code includes guidance to setting up the PC.
The PC register the PID and VID (product ID) of the USB device when
it's plugged, the VB code uses these ID's to communicate with the
device. For commercial VID it is needed to buy it from USB-IF, but in your lab you can use any number.
The source code is derived from freeware from these sources: http://janaxelson.com/usb.htm , http://openprog.altervista.org/USB_firm_eng.html
You are free to use the circuit diagram and the VB software with no
See also Technical Tips
Pins 2-5 are the analogue inputs, voltage range 0 to 5V. Max input voltage
is 5.5V . 1K resistors are to protect the PIC.
Pins 25-28 are the digital inputs, TTL voltage levels.
Pins 21-24 are the digital outputs, they can sink or source 16mA.
Pin 14 is 3.3V internal supply for the USB transceiver. 0.22uF is
required for regulation.
Pins 15,16 are the data lines to the USB connector on the PC.
Pin 20 is the PC 5V powering the PIC. It is limited to 100mA by
the PC. 0.47uF is for decoupling.
For USB wiring info: http://www.interfacebus.com/Design_Connector_USB.html