This is 16-Channel 12-bit PWM and servo Shield for Arduino, perfect in building a robot.
This shield is perfect if you want to build a robot, perhaps a hexapod or a project that requires several components that require movement. It is also ideal in controlling many LEDs with precise PWM signal and perform microprocessor has a limited number of PWM pin. For this applications, the shield of servo-motors with PWM driver is the product you are looking for. Using this shield, 16-pin PWM can be controlled with just 2 pins I2C interface.