Robot Number 3
Robot No1 was the LMR kit and came about as part of my desire to learn about microprocessors. It was no good simply reading about code I had to write and play with it to understand it and robots seemed like a fun way of doing this.
Robot No2 was the old Picaxe "Mr General" kit which provided many hours of "education" and by then I was ready for No3.
Robot No3 was custom made using Picaxe 40X2 and 08 microprocessors, SRF06 ultra sound for the main proximity sensor (on a servo so it could look from side to side) and a host of other IR sensors to detect drops and low edges which I had discovered caused havoc if you only had the main forward looking proxinity sensor.
I found a few goodlooking "bicycle" wheels on a model pennyfarthing bike then gave the robot a "head" with a flashing (RGB) "brain" all made from acrylic. The RGB LED in the brain is driven by the Picaxe08. It started out with green for forward and red for turning but I thought it looked better with RGB sequence.
Code is similar to the LMR kit with extra subroutines to interface with the additional sensors. It also has variable forward speed depending on the "free range" ahead. It slows as it gets closer to an obstacle similar to the Mr General robot.
Another feature is an easy to use "kill" switch which stops the operator having to grab the robot to turn it off. I've added an IR sensor looking above the robot. All you have to do to stop this robot is hold your hand over it. Much easier (and less traumatic for the robot) than trying to hit an OFF switch while it is on the move.
In response to a request from fpictor a photo of the "Motherboard"