Speed Control of DC motor using Microcontroller and motor driver L293

Using Microcontroller we can easily control or interface a DC motor with direction control. but if we wants to control the speed of a DC motor. in DC we are use PWM technique to control average power delivered to load. so also here we use PWM technique to control speed o a DC motor. in motor driver L293 first & ninth pin are enable pin.

L293D pin diagram

       the first pin EN1 is use to enable IN1 & IN2 pin to get input and same as EN2 is use to enable IN3 & IN4 pin. if we simple drive a DC motor we connect these both pin to +5V applied at 16th pin
of L293.but to control speed of DC motor we are connect these both pin to PWM pins of Microcontroller.then we can simple control the speed of DC motor by control the Duty cycle.