Hello,
The other parts of the project are posted here on ROS Discourse. Here are the links for the other episodes currently out.
Topic: [ROS Projects - S1E1] Create a robot for a restaurant
https://discourse.ros.org/t/ros-projects-s1e1-create-a-robot-for-a-restaurant/11404?u=rebeccau
Topic: [ROS Projects - S1E2] ARDUINO Load Sensor for Restaurant ROS Robot - Part 1
https://discourse.ros.org/t/ros-projects-s1e2-arduino-load-sensor-for-restaurant-ros-robot-part-1/11482?u=rebeccau
Topic: [ROS Projects - S1E3p1] Create the Simulation of the Restaurant Robot - Part 1
https://discourse.ros.org/t/ros-projects-s1e3p1-create-the-simulation-of-the-restaurant-robot-part-1/11599?u=rebeccau
Hope that helps.
-Rebecca