What to do next?

[nobtiba]

I have now gyro.c and gyro.h (and all navigation.zip too!) but can you tell me what software and hardware I have to take to make it work?
All I have now: ADXRS150, uC: ATMEGA8535 with 10bit ADC, superior loader to load program into uC. I also have a software which I wrote in Turbo C and it can receive data from ADXRS150 gyro through ADC of uC. It can measure voltage by software very exactly but when I change to angular it not exactly:
real 10 degree but value in software only :9.89
real 20 degree but value in software only :14.5
real 30 degree but value in software only :20.3
May be it cause of intergration in my software. I didn't measure the interval between a sample and the next exactly.
So I want to try another method as Kevin use here.
And again, I want to know what software, hardware I need to have and what to do next?