You want to make a robot, When we saw this chip, we quickly realized what an excellent add-on this would be. Using only two pins, control 16 free-running PWM outputs! I2C input, control 16 PWM output, you can control the 16 way servo motor.
Frequency: 40-1000Hz. Channel number: 16 channel. Resolution: 12 bit. Voltage: DC 5-10V Size: 60*25mm Color: blue Net Weight: 12 g
Package Included: 5 x PCA9685 16 Channel 12-bit PWM Servo motor Driver I2C Module For Arduino Robot WC 5PCS PCA9685 16 Channel 12-bit PWM Servo motor Driver I2C Module Arduino Robot