http://www.microchip.com/forums/m116779.aspx
Mouse wheel pic18f2550 —
http://www.microchip.com.edgekey.net/forums/m676193-print.aspx <— this one–> 2550_Mouse_Wheel.zip (99.49 kb)
https://www.google.com/#q=USB+HID+Mouse+Wheel+On+PIC18F2550
http://www.microchip.com/forums/m468995.aspx
http://www.libstock.com/project_categories/view/22/usb/page:2
http://www.pololu.com/file/0J472/MMA7361LC.pdf
http://www.pololu.com/product/1247
MMA7361 Accelerometer Sensor Acceleration Module Angle Inclination Sensor
http://www.amazon.com/Kootek%C2%AE-Arduino-MPU-6050-gyroscope-accelerometer/dp/B008BOPN40/ref=pd_sim_sbs_indust_3?ie=UTF8&refRID=18VT5W61R8K9C3SDQ779
Kootek® Arduino GY-521 MPU-6050 Module 3 axial gyroscope accelerometer stance tilt module
https://www.google.com/#q=triple+axis+accelerometer