I have a problem for which I have one of the way of solving it, I'm not sure its the best one.
So I have to control 20 DC motors with speed and direction control using H bridges so in a perfect universe I need 40 PWMs.
At a time 1-3 motors will be active.
My solution :
Connect edison to an arduino mega2560 with 15 dedicated PWMs pins and use softPWM library and communicate edison and arduino via i2c. This just a thought yet to be implemented. I'm sure if I walk down this path I be able to do it.
There is an PWM expansion board called TLC5940 which gives 16 PWM channels and can be daisy chained, but the libarary is not compatible with edison yet.
Later on in the development I plan to use edison's wifi/BT to connect to handhelds and control motors from it.
Thanks for you help.