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triangular pwm
This sounds way too complicated. The PIC you're using has built-in support for PWM generation, and it's pretty easy to use. Just look it up in the datasheet.
Is there a reason why you can't use the PIC's built-in PWM hardware?
optocoupler schematic
Have you looked at the wikipedia article? It explains what optocouplers are and gives an example circuit. Also, check out the links at the bottom of the page for more information.
l298n pic
Look in the **broken link removed** at Figure 6. It shows how to connect the driver to a single motor, by using one of the driver's channels. Just use another channel (look at the pinout) and you can connect two DC motors.
As for the PIC, look up how to use the timers. The PIC16f877...
Unfortunately, English grammar is too complex and irregular to check properly. Word's grammar checker is probably about as good as you're going to get (i.e. pretty lousy), but ultimately you can't trust any grammar checking software.
Word will point out most major mistakes. Get a native English...
orcad for linux
gEDA is not so much an EDA package as it is a collection of tools which mostly work well together. I've been using it recently for PCB design. The way that works is, you make a schematic in gschem and specify the PCB footprint of each device. Then you run a command line program...
For measuring angles, you could use a rotary encoder, unless I've misunderstood your design. It has a turning thing, and it will tell you how far it's turned.
Another approach would be to use a potentiometer as a voltage divider. That would probably be cheaper, but less precise. Probably...
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