We are a laser sensor and photonic DIY parts supplier including sensing modules for robot application. Laser obstacle sensor module used in the robot: https://www.iadiy.com/technic-blogs/laser-sensor-module-guideline LOS1V110F30 module is designed for the roombot and mass production for Japan company. It's also can be used for DIY robot by USB port.
I'm producing a complete and highly detailed video series on building the AR3. Here is the first episode. :) https://youtu.be/D5laewcAJ1Q Enjoy!