Quadcopter using Cyclone II. How to implement gyro inputs and ESC outputs?

Hi Koo,

I don't know all the ins and out of the DE2 but I'll try to answer your questions:

1) PWM can be done in a number of ways. Google delta-sigma. PWM is nothing more than a programmable counter that toggles a bit at a certain threshold.

2) Digital for most boards unless there's an A/D converter connected inbetween. Check the DE2 manual

3) Whichever you feel is best for your application.

4) I have no clue. Have you checked Sparkfun yet?

5) Probably not.

Personally, I think a microcontroller would probably be a better solution. Most micros have D/A converters, PWM, and pretty much everything else under the sun for less than a few bucks. Unless your design is completely static (i.e. it's a simple, fixed function) I'd go with an Atmel / Microchip solution. Gets you a free IDE as well!

-Mux