# Electronic Circuits and Projects Forum

## Magnetic wire to define border area for robot path

1. Originally Posted by 4pyros
Why not?
Because you will need a lot of hard drives

2. Originally Posted by cr0sh

Fortunately, though, I am currently taking the Udacity "CS73: Programming A Robotic Car" being taught by Sebastian Thrun (http://www.udacity.com/overview/Cour...rseRev/apr2012), which aims to give you the skills to "Learn how to program all the major systems of a robotic car from the leader of Google and Stanford's autonomous driving teams".
It's very interesting! I enjoed the course, too!

3. Originally Posted by marcusbarnet
It's very interesting! I enjoed the course, too!
Yeah - I missed the first iteration of it, but when I saw it was running again, then found it was a "self-paced" course, I decided to try it out; right now I am beginning the last programming question before the homework on unit 2. Last night it didn't make any sense to me, so I am hoping it makes better sense here in a few minutes (been procrastinating on it a bit - but hey, self-paced, right?). I think he is wanting you to implement a 1D Kalman using matrix math (as I am sure the homework is to do the same, in 2D - but I haven't checked), but it didn't seem clear to me last night.

4. Welp - just got past it; re-watched the video and realized that he wanted us to implement a multidimensional Kalman - not 1D. Once I understood that (and the matrix class he supplied), it was relatively straightforward to plug-n-chug the pieces in place to implement the Kalman properly. Now on to the homework...

5. Multidimensional Kalman filter is one of the most important tool to develop mobile robot: I remember it when I studied, this kind of filter was in a lot of exams

6. ok just a thought but, how about a remote controlled mower, the idea being you drive it around by remote once and it saves the info in memory so next time it just follows a save path all you would need is decent encoders ect on the motors. or is this a stupid idea

7. Wheel slippage is enough to make the remote idea not work.

8. Originally Posted by 3v0
Wheel slippage is enough to make the remote idea not work.
Yep, encoders are good only if you are on a good ground, but they are not accurate if you are in a sandy terrain because wheels can slip and give bad readings.
I think the dog fence is the only suitable solution at this moment in addition to a non-randomly path.

9. This is a rough idea and it would take a good number of magnets.

Use rare earth magnets at the end points of each path/strip to be cut. Use an electronic compass to move from end to end.

Play with the setup to see what % overlap is needed to prevent missing grass.
This would mow east and west.

Code :
```East Magnets                                                  West Magnets
---                                                                   ---
---                                                                   ---
---                                                                   ---
---                                                                   ---
---                                                                   ---
---                                                                   ---
...
---                                                                   ---```
You could get fancy and use the magnets as addresses.

10. Can you explain better your suggestion, please?
It looks interesting..

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