+## prerequisites
+
+install the following software:
+
+[openSCAD](http://www.openscad.org/downloads)
+
+[fritzing](http://fritzing.org/download/)
+
+[arduino ide](http://arduino.cc/en/Main/Software)
+
+## quickstart
+
+[openSCAD tutorial](http://goo.gl/E3OQXc)
+
+[build the challenge-bot](http://goo.gl/XgB0xq)
+
+## Introduction
+
+Most introductory robots are "dead-end" robots that
+tend to strand people after they have the first
+few robot behaviors implemented -- obstacle avoid,
+wall follow, stay on table, etc.
+
+One of the primary goals of the challenge-bot is to try
+to make it expandable from simple to more complex in
+reasonable incremental steps.
+
+The base is organized around 1-inch x 1-inch grid peg-board
+which is readily available from locations such as Home
+Depot, Lowes, and lumber stores.