This product is a PWM/servo expansion board based on . It can expand 16-ch servo control or PWM output through the PCA9685 chip, and each channel has a 12-bit resolution. With the I2C interface for controlling, it does not require any other pins. The onboard 5V voltage regulator chip can be connected to the battery, and the maximum output current is 3A. It is suitable for controlling robotic arms and servo robots. With right angle pinheader, possible to connect servos even when stacking up. Needless to say, the is powerful enough in most cases, yet it's not that good at providing precise PWM output. You may have tried to control a robotic arm or a hexapod walker by using the Pi, but finally get frustrated due to the limited number of PWM outputs and the jittering servo. Now you get a new option to bring your ideas to life, we prepare this useful Servo Driver HAT . Standard 40PIN GPIO extension header, supports series boards, Nano I2C controlled, using only 2 pins Up to 16-Channel servo/PWM outputs, 12-bit resolution for each channel (4096 scales) Integrates 5V regulator, up to 3A output current, can be powered from battery through VIN terminal Standard servo interface, supports common used servo such as SG90, , , etc. Reserved I2C control pins, allows to work with other control boards Power supply: 5V (Pi connector) OR 6V~12V (VIN terminal) Servo voltage: 5V Logic voltage: 3.3V Driver: PCA9685 Control interface: I2C Dimension: 65mm x 30mm Mounting hole size: 3.0mm Colour:blue Material: PCB Package Contents: 1 x Servo Driver HAT (B) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.