jessejay

Member Since: May 23, 2006

Country: United States

  • Thanks. I'm excited for the opportunities! :)

  • 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.

  • 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. :)

  • 100 samples per second

  • I think the easy thing to do is use a micro like an ATTiny85 and it could decode the serial data, and output the position data rather then serial stream. In fact for the TFMini someone has already done it. See https://discuss.ardupilot.org/t/avoidance-experiments-with-the-poc-and-benewake-tfmini I've been thinking you could have a generic board, and provide different code for different devices.