paper: [Ri3D] The GreenHorns 2016 Present: Rivvet

[greg7mdp]

Thanks a lot for the fast answer, much appreciated. I wish I had a picture of our shooting mechanism to post, as I don't know how to explain it well. I'll try to get one tomorrow evening and post it

I understand what you say about vision tracking, but I think we could make it work if we had an accurate way to set the shooting arm vertical angle. I somewhat have it working on my PC, processing images (from a webcam) with OpenCV in one process and sending instructions using network tables to another process running a robot simulation with robotpy. I also run the same OpenCV image processing running on a raspberry pi mounted on the robot. However, without an accurate way to set the shooting arm vertical angle, this will never work.

Why isn't a servo a good solution? I thought it would allow for repeatable settings, but clearly I must be missing a big issue.

[Ginger Power]

Anything is possible with a dedicated software mentor and some time. I would never discourage a team from trying new things and growing their knowledge base. If vision doesn't work how you want, just be sure to have contigency plan!

I'd love to comment on a picture so I can give it a fair assessment. Here's what I can say: If your shooter is mounted on a live axle (for example a hex axle that rotates with the shooter) then you should easily be able to drive the shooter up and down via a hex sprocket on the live axle, and another sprocket on your Gem 500. I'd use #35 chain. You shouldn't need to direct drive the shooter axle, and doing so would be harder to implement I think.

There are benefits to being addicted to Chief Delphi. Quick replies being one of them.

[cadandcookies]

Just wanted to drop in and say thanks-- the Greenhorns robot was a key inspiration for 2667 this year, and I don't think we'd have built the same robot without yours existing.

We look forward to seeing 4607 at North Star Regional!

[Ginger Power]

Originally Posted by cadandcookies

Just wanted to drop in and say thanks-- the Greenhorns robot was a key inspiration for 2667 this year, and I don't think we'd have built the same robot without yours existing.

We look forward to seeing 4607 at North Star Regional!

Thanks Nick! That means a lot. Snow Problem's robot was amazing this year as well. I think we're really starting to figure out this whole 3 days thing. Too bad our teams can't do the same thing

[greg7mdp]

Thanks again for all the help. Here is a picture of our robot. It may look familiar... imitation is the sincerest form of flattery :-). We may have a solution for tilting our shooter, as we had some help today from a motor expert.