@james-whitee If you can't see your desktop folder, then most likely you launched Jupyter Notebook from somewhere else. Close Jupyter and reopen your terminal to try again. If you still can't navigate your folders, attach a screenshot and maybe I can figure out where you had launched Jupyter. 
@krishna Please create a new cell and run the following code:
!sudo rm /home/pi/offsets.txt
This will remove the offset file. when you rerun the calibrate code it should generate a new file for you. If you are still having the same issue, please update Zumi as this was an issue with an earlier version. Let me know if you have any more questions.
@gpvillamil Thanks for your feedback! A start block that marks the executable code is a great idea. For the other error, could you attach a screenshot? The "Run" button should be executing the code.
Hi there @Techvet! I was actually the one that worked on the setup we had at our booth at CES, where you see the trees and mountains. Yes, I believe most things were O scale, and some HO scale. I bought a lot of things from the local model railroad shop. I got trees, two plastic molded mountains, some buildings, and then a bunch of Lego buildings as our landmarks. I also used a vinyl print of the road, so that we could get a single consistent piece to lay down on the board. It was a pretty large print, so I worked with a banner printer, then cut out the road by hand from the vinyl banner.
The actual floor of the "Zumi World" was 2 wooden boards wrapped in a green cloth and stapled to keep it taught.
Hopefully that gives you some ideas!
Glad to see you’re excited about the mat! We priced it based on the cost of the material, and how much robotics mats are usually priced at. We’ve been testing various mats, and we finally found a US company that can make a mat that is durable enough to not curl that much and roll up for transport, while having clear graphics that can work with the sensors. We find that a lot of robotics mats are actually priced above this, such as Dash & Dot mats, Sphero mat, and FLL competition mats, which often are priced around $145 - $180.
Of course, if we find that the price ends up being too cost prohibitive for our customers, we will certainly revisit and see how we can reduce the price.
I hope that answers your question!
@octavio-filip It sounds like the switch may be malfunctioning. To be sure it's not a firmware issue, could you attach a video? Thank you!
@kamal ,
It looks like you are missing the board files for Rokit. You can follow steps 1C or 1D (depending on your machine) from our lessons page and make sure you go through all the steps. Let me know if you have any more questions.
@james-whitee CoDrone does not have the capabilities to follow lines automatically. You would have to use the FPV module and computer vision in Python, however, we do not offer those lessons on our website. For pattern flying, check out our documentation. Hope this helps!
@krishna It sounds like your motors are connected backward. Switch the motor ports and let me know if this helps!
