Older blog entries for robotvibes (starting at number 4)

3 Nov 2005 (updated 3 Nov 2005 at 03:27 UTC) »

Greetings,

OK..back in action. After Hurricane Wilma came through, I didn't have any electricity, or phone service so I was unable to post an update. So now that things are returning to normal, I can continue with UltraMega.

I was able to mount the bump sensors on the chassis, and it seems like it will work fine. I am using a strip of transparent vinyl tubing with the music wire inserted inside. The tubing is wrapped around the front of the chassis, and also covers the left and right sides for the front end.

The internal wire will be connected to ground, and small strips of wire inserted through the tubing will be the Normally Closed (NC) contact, of the bump switches. Tinkering, and some rudimentary testing yielded successful results, as the music wire created a spring-like effect, and the tubing allowed some shock absorbtion.

When I am done with mounting the assembly, I will be connecting it up to the debounce cct, and testing the response. The schmitt trigger ICs should clean up the signal also, which will be sent to the interrupts of the AVR. The microswitches will also be added, but I am still noodling their correct placement.

I have also moved the IR sensors up to the 2nd deck. The left and right sensors are positioned to detect objects within their respective field of views. The front sensor is mounted on a stepper motor that will scan the "blind spots" of the left/right sensors.

An updated schematic, and pics will be added to the site soon. Stay tuned....Peace!

Greetings All,

I have installed 2 new features on robotvibes.com, which are "Gallery", and "Downloads". I am working on changing the layout/look of the site as well.

I added my Tech Project proposal of UltraBot 1.0 to Downloads. I am not sure where the Final Project is, but you can get the general idea from the proposal.

I am also working on fleshing out some details for the current specs of UltraMega. This will be available in the Downloads section, and a summary in the Journal.

Still tinkering with mounting the bump sensors, but the debounce circuit is built, tested and ready.

Stay tuned....

3 Oct 2005 (updated 3 Oct 2005 at 18:42 UTC) »

While designing the bump sensors, it deemed necessary to install the front and side panels on UltraMega, as the sensors would be mounted on the front/sides of the chassis, forming around UltraMega's body. I will be using piano wire, and some "nylon nose gear bearings" used on model airplanes to attach the bump sensors to the panels. This may still need some tinkering, to get the best response when UltraMega bumps into an object. The front/sides are now enclosed behind the panels, which are transparent lexan, that allows one to view inside the body (Nice looking!).

I have also built the debounce cct for the bump sensors, and will be connecting them to the AVR external interrupts, and testing them out.

I finally wrote up a 1 page spec of UltraMega, which should be available in Downloads. Though some updates will be made, as I get the chance. Some schematics will also be available as well.

The light sensors(Cds) will be installed next, connected to the AVR, and starting programming behavior experiments.

Note: current pics coming soon...

I designed the debouncing cct for the bump sensor in OrCad. I am also experimenting with some microswitches and piano wire for the front chassis, along with a thin strip of Lexan for the bottom of the chassis.

I have lots of documentation roughly written on paper(schematics, charts,etc.), so it needs to organized and converted to electronic form. I will also have them available here as well.

For robotvibes.com, I am planning on installing a picture gallery for the robots, and change around the look a bit.

26 Sep 2005 (updated 26 Sep 2005 at 18:49 UTC) »

Greetings,

I have mounted the controller power and reset switches on the 2nd level. Once the panels are mounted, the switches should be exposed just enough to toggle on/off or push reset on the controller.

I also finished up the AVR controller, and it is also installed. A quick interface test with the PonyProg yielded successful results, as the code is read/flashed. Next on the list: Bump sensors, Odometry, Light Seeking/Avoidance behaviors, and more...

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