Since the goal of this project is to teach kids in the domains of STEAM (Science, Technology, Engineering, Arts & Mathematics) we have spent considerable time in developing different activities for kids. These include, 

• Obstacle Avoidance Codi
• Maze Navigating Codi
• Delivery Bot Codi
• FireBot Codi
• Astronaut Codi
• App Controlled Codi

Each kind of robot uses a different kind of sensor. The idea is to use theme based learning instead of just simply interfacing sensors. In order for all of these different sensors to be used with Arduino (which is Codi's main controller right now), we needed to develop a few small circuits of our own. 

These include

• A power distribution circuit to provide power to different circuits
• A power circuit to connect the FAN for FireBot Codi, Servos for the Robotic Arm extension 

The circuits can be seen in the following images. Please keep in mind that we are trying to save costs, so the PCBs are simple and made using a local supplier. 

So instead of just developing a completely new board that would include this functionality we have developed smaller cheaper components that simple connect with the power and the Arduino interface keeping the costs down.