PCA9685 16-Channel PWM Servo Driver Module

A robot with more than a couple of servos runs out of PWM-capable pins fast on a typical microcontroller, and this board solves that with a dedicated PWM generator chip controlled entirely over I2C: two wires drive all 16 channels, with the PCA9685 itself handling the actual PWM signal generation and timing rather than the host microcontroller juggling sixteen simultaneous signals.

12-bit resolution per channel gives smooth, precise servo positioning rather than the coarse steps an 8-bit driver would produce, and multiple boards can chain on the same I2C bus at different addresses - a robotic arm or hexapod needing more than 16 servos just adds another board rather than hitting a hard channel ceiling.

Standard driver for multi-servo robotics: hexapod and quadruped robot legs, robotic arms with several joints, and any build where the servo count has outgrown what the microcontroller's own pins can drive directly.