how do i control DC motor speed using dac and pwm

[viccram]

pwm to dc with dac

i am an engineering student and trying to make a robot.i have used motors to move the robot but want to vary the speed according to the need.

 

[pabloec]

you first read

https://en.wikipedia.org/wiki/Pulse-width_modulation

If you have any questions after that please ask.