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September 26, 2011
Director of Creative Robotics Ltd
University of Sussex
There appear to be some errors in the schematic linked to on this page, and for the 5v part. Pin PB0 is the SS pin but has the net name MISO and PB3 is the MISO pin but has the net name D14/RXLED - in the caterina bootloader source the RXLED pin is PB0, not PB3 … looks to me like the PB0 and PB3 names on the 32u4 schematic part have been swapped over by accident.
about 2 years ago
Thanks for the feedback, it is a good point and I think we will try and include connectors plus pin headers in the future. We are just testing our own Arduino Leonardo clone that has exactly this set-up - It has a pair of HUB-ee connectors but their pins are also available on 0.1in holes that you can solder our breakout boards to.
about 3 years ago
Ah! It seems that we did actually correct the ‘motion control example’ code with ‘Wheel1’ and ‘Wheel2’ and pull-ups enabled - we just didn’t upload the latest version to the website. Bad us. It is fixed now.
Thanks! The need for pull-ups is explained in the user guide but you are right to point out that it is an importnat detail that we should have made clearer. I have updated our product page with this info. We made an even worse mistake by not updating the code examples - the video and the motion control example both relate to the earlier version of the board where pull-up resistors were not required so I can see how that confuses thinge even more.
We will update the code examples, and correct the left/right wheel confusion - We should have stuck with ‘Wheel1’ and ‘Wheel2’ to match the schematic.
We appreciate the feedback, and we hope you enjoy using the shield.
We scratched our heads over this when designing the boards and concluded that this was a better all round option because … if you want the cheapest version you can just buy a single cable, cut it in half and solder it to the board, or you can solder on a break out board to have the connector, or a cable splitter board to run pairs of wheels in sync.
News - Enginursday - Three Child…
about 3 years ago
Not exactly OT, but at a tangent - I used to have a BBC micro computer and the BBC basic editor had an auto line numbering command. I once tried setting it to increment in steps of 1000 and got the error message “Don’t be silly”
about 3 years ago
dbc - Sorry to hear you toasted your wheel. We will be opening up shipping to the US on CreateBots soon - Unfortunatly that might not help you much as our current shipping solutions to the US (FedEx) would end up costing you more than it would cost to just buy a replacement wheel from Sparkfun. It would only really be worth your while if you wanted to order a bunch of other parts from us as well (and we will be super happy if you decide to do that!)
The short answer is .. quite a bit, probably a couple of degrees - these aren’t really designed for ultra precise motion jobs.
News - New Product Friday: HUB-e…
about 4 years ago
Ok, looks like 5Kg is too much for them to handle - the bot starts to moves but the motors stall out pretty quick (running off 7.2V) - reducing the payload to 4Kg gets the bot moving but even then any attempt at skid steering is going to fail because of the additional loading this involves - I will repeat the experiment with the 180:1 versions and see what happens. I’ll put together a video, and write it up for our website.
Excellent question. My daughter and I are just filling up her cardboard box bot with stones in order to test it out - So far it just manages to move with a 5Kg load (4x 120:1 wheels running from 6xAAA NIMh batteries), but the batteries could do with a charge so I’ll report back in a few hours and put a vid of the results on our Youtube Channel
I’m going to guess that your battery, cam and controller are unlikely to be more than 5Kg so they whould work fine.
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