Step 1: Constructing Body and the Plywood Cutting Plan
Step 2: Circuitry Etc
a- Two sound sensors. Independent two condenser microphone sensors at the right and left. With these sensors, the robot can hear the sounds around it and also differentiate between sounds coming from the left side and right side.
b- Light sensor. This is a photodiode located at the front of the Robotrex facing forward. With this sensor, the robot can sense and measure the light level around it as a 5 bit (0-31) value.
c- Infra Red (IR) obstacle detection. With this microprocessor based (OZZ-IR-DIS chip) dedicated circuitry Robotrex can sense the obstacles on its way as well as obstacles at the right and left sides within a limit of almost 40cms. Sharp's IR sensors can also be used in a similar manner.
Along with the sensors, the Robotrex has got a "Mood" display consisting of a 5x7 dot matrix LED display where it can display its mood as smiling, crying, scary etc faces (16 total). The mood display can also be built and used as a stand-alone module. While the mood display is showing the emotions of the robot the main processor can also produce a variety of sound effects to improve the communication of the robot with the outer world.
Step 3: Brains and the Body
As the structure, you can use plywood for making the parts as well as mock-up plastics, sheet aluminium etc. You can give organic forms over the finished structure by using polyurethane foam and obtain a smooth surface by sanding and finalizing the shape by applying steel putty & resanding. With these, the robot can become a better looking dinasaur or any creature you like. It is all up to you. The project can be modified in any way you like.
Before starting to build robotrex, don't forget to read more about its ancestors; The Bigfoot and The Goggles. The articles about them can be found at our robotics website http://www.endtas.com/robot. The circuit schematics, photos etc in those articles can be helpfull while building the Robotrex. And if you have questions, just add them to the end of this article as comments. I'll try to repply them as soon as possible. Have fun and build many dinosaurs. :)