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May 23, 2006
News - Story of a SparkFun AVC R…
about a month ago
1) Motor is a RC4WD 540 motor with 35 turns. No changes needed, any 540 motor should be able to slot into place without much issues. I'm using a Castle ESC and it can work with brushed and brushless motors with just a setting change.
2) It is a trick/practice to learn how to set the same initial angle. When I'm testing I use cracks/cuts in the pavement to line it up. For AVC I would use the sections of the start/finish line itself. There was an assumption that this would not move. Which for at least one year was not the case, but other competitors noticed and brought it up and it was moved back. I have looked at using compass to get the initial angle, but the accuracy is never been there. Less error by ignoring the compass.
3) I'm working on a new "speed" rover and plan to compete with the local RC guys for now, and try to beat them at least on time for now, then I'll try to beat them in a race after that. But I expect this to take a couple years to get there. I'm hoping to organize a Midwest/Iowa AVC for some future date. I have monthly meeting of "DIYRobocars" to get more interest locally, but not made a lot of progress yet. I've got other projects I'm working on as well, and you will hear more about them soon.;)
News - SparkFun Ambassadors: Cla…
about 2 months ago
Thanks. I'm excited for the opportunities! :)
about 3 months ago
Ted. I had same questions and my research shows it doesn't support i2c, or if it does there is no documentation on how it works. The connector is 1.25mm picoblade and it is a real pain to use with 2.54mm headers. I have some ideas but other projects currently taking up my time. A converter board to standard 0.1 spacing would be an awesome addition. I agree about the wire and don't dare want to splice given it's so thin.
News - Story of a SparkFun AVC R…
how's this for accuracy?
I modified the rpm sensor setup so I now get 3 pulses per revolution instead of one. Wheel slip isn't an issue if you go slow enough, and there is no issue with the differential gear. The front/rear differential are just gear reductions, and there is no slippage in them. They actually help with a gear reduction to increase encoder resolution. I removed the slipper clutch, so in the whole drive train there is no slip. I think the results speak for themselves. Over a Sparkfun sized course my error is often a foot or less. The dirt track this year will be the biggest variable, so I am working on ideas to counter slippage.
I was just saying older slashes don't have the built in mount for the sensor. So you are on the right track. Wall following. Good idea, but how do you deal with the figure 8?
Kelly, GPS can be tricky. ;) I'm use the standard Traxxas sensor, part number TRA6520. Black pin = ground, Red Pin = 3.3, and the White pin I've got setup with a weak pull down, and have an interrupt to detect pulses. To make this work you may need change a couple other parts. You'll need to have the telemetry ready parts or get replacements for the stock ones. If you need more help you can contact me through the Google Groups Forum
Thanks. I got second in 2015, and that really motivated me. My rover did not push through the barrels last year, it rammed them! LOL. I've given some ideas to the Sparkfun team on how they could change the course to make it harder. Being on a dirt course this year will make replaying challenging and I know two years ago I had some minor issues with the dirt section. I expect the course to continue to get harder over the years, which is why I'm looking at various new technology to do real time mapping and navigation of the course. But I'm not ready to reveal how as of yet. ;)
Thanks. It certainly does. I got the idea from another Sparkfun competitor, Data Bus. :)
about a year ago
100 samples per second
parts needed for botzfight project
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