Description for 4 2-DOF Pan Tilt HAT Light Intensity Sensing I2C Interface 40 PIN GPIO Extension Board for Camera This is a 2-DOF pan-tilt kit designed for . With onboard PCA9685 PWM chip and TSL25911FN ambient light sensor, it allows the Pi to control camera movement and sense light intensity through I2C interface. Standard for 40PIN GPIO extension header, supports for series boards, Nano I2C interface, only 2 pins are required for moving and light intensity sensing Onboard PCA9685 chip, provides 12-bit resolution PWM signal for moving control. Onboard TSL25911FN light-to-digital converter, with embedded ADC, provides a value that approximates the human eye response to assist the module Onboard voltage level translator, compatible with 3.3V/5V operating voltage Specific acrylic board to fix for the camera, easy to install Comes with development resources and manual (demo code, assembly guide) PWM driver: PCA9685 PWM resolution: 12-bit Ambient light sensor: TSL25911FN Ambient light resolution: 16-bit Communication interface: I2C Operating voltage: 3.3V/5V Dimension: 56.6mm x 65mm How to Assemble: A little assembly work is required to use the 2-DOF Pan-Tilt HAT, yet its pretty easy to do, heres the assembly guide. (Delivered as unassembled parts) Color: As Shown Material: PCB + Plastic + Copper Package Contents: 1 set * for 2-DOF servo gimbal expansion board 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.