Let's Make Robots!
Goes around the four legs of a chair to meet the chair challenge
Using a
Here is the program for the robot :-) Since it just uses its encoders to do the moving it will drift over time as you can see in the video... - Jimmy Read more

Anybody up for DTU Robocup?

The Technical University of Denmark is soon holding its annual robot competition "robocup" and the deadline for entering is on Monday the 17th of March. The actual competion will be from the 8th of April to the 10th of April AFAIK.

Simple test with PICAXE and a monster truck

Just tried out controlling my radio controlled monster truck with the picaxe. It's a simple test run of forward, turn left then right and then stop. I put the car in a spot that almost made it reach the bathroom :-). Notice how the breadboard almost flies off when the car turns... a really solid construction! :-)

bonzer_monster.jpg

I'm looking forward to making something useful out of this car... it can go pretty fast!

Dang! I can't seem to embed video in a blog post???

36 KHz modulated infrared light detector

I have started working on a new robot that is mainly based on LEGO MINDSTORMS NXT. This robot is aimed at participating in DTU robocup 2008 but time will tell if it will be finished in time. Anyway in robocup the robot must at least be good at following a black line and preferably it should be able to accomplish other of the tasks at hand as well, and this is just not feasible using the standard LEGO sensors and the very limited number of these it can use at one time.

Since this project is not finished yet the robot just sits there for now...
Using a
Most of the LEGO platform used for this robot was used in DTU RoboCup 2006. PICAXE Pete is my first time using the PICAXE controller. The robot has a homemade line … Read more
When I started out with electronics I didn't really know where to look for information. Most books I stumbled upon were much too heavy on the theory of electronics … Read more

Oh no the horror!

After testing the motor driver and writing some code to control the robot based on line sensor input, I tried it out... Nothing seemed to happen so I double-checked the PICAXE 40X1 schematics with my robot's wiring and I have completely forgotten, that the two L293 pins for enabling motors should be wired to PWM outputs (Noooooo!). I guess I'll have to get my soldering iron heated and perform surgery on poor Pete. I was so happy that all the hardware I had wired just worked the first time... and the I go and do something like this *sigh*.

Motor driver tested

Today I tested that the motor driver circuit of PICAXE Pete does in fact work. I'm now in the process of writing some code for line following using my standard technique: find out where the line is by taking the mean value of a histogram of the sensor values and using this to calculate a regulation term for each of the two motors.