SpammerHellDontDelete: New page: =North Paw Hack Notes, July 17th, 2009= =Sticky Back Velcro= Eric bought $20 worth of sticky back velcro at the Fabric Outlet, and proceeded to cut small pieces for the enclosure, the ba...

2009-07-17T23:49:45Z

New page: =North Paw Hack Notes, July 17th, 2009= =Sticky Back Velcro= Eric bought $20 worth of sticky back velcro at the Fabric Outlet, and proceeded to cut small pieces for the enclosure, the ba...

New page

=North Paw Hack Notes, July 17th, 2009=

=Sticky Back Velcro=

Eric bought $20 worth of sticky back velcro at the Fabric Outlet, and proceeded to cut small pieces for the enclosure, the battery packs, and the stuff necessary for the motor pockets. 30 kits worth took about an hour.

==Compass Chip Research==

Eric found this interesting paper on [http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.nxp.com%2Facrobat_download%2Fapplicationnotes%2FAN00022_COMPASS.pdf&ei=g-1gSuyWG4LmlAeFj63wCQ&rct=j&q=compass+chips&usg=AFQjCNEcC9aPeLRmwdb_PY_hS2iwxnlkmg Electronic Compass Design using KMZ51 and KMZ52], the KMZ51 is [http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=568-2425-1-ND out of stock] at digikey, but priced at only 4.67/1, 3.74/25, etc. My brief reading of the stat sheets makes it look like this is a 1-axis compass chip, only available in surface mount. So we'd need to make a little module with two of them and some headers. But I imagine in quantity you could get the cost of said module down under $10.

There are also lots of little "hall effect" magnetic sensors, e.g. [http://www.asahi-kasei.co.jp/ake/en/product/hall/series-hq.html Asahi HQ-0111], which could be adapted as above as well. No idea on pricing of these though.

Also, I found the iPhone chip, it's an AKM part, [https://webapps.nuhorizons.com/storefront/PartSearch.do;jsessionid=FB2DEB463D3D15DE8007671936DCFE8F?PostAction=GO&ItemsPerPage=25&PartNumberHolder=&Mode=initSearch&Commodity=ALL&InStockOnly=FALSE&I6.y=0&Manufacturer=ALLMFG&InStockOnly1=N&PartNumberSearch=AK8973&pSearchType=CompanyPart&PageNum=1&PbFreeOnly1=N&NextPage=1&I6=go&ResultsPerPage=10&PbFreeOnly=FALSE&I6.x=0&prevSearchType= AK8973], available for $6.30, min order 3000. We'd have to build a breakout board, but there is already [http://forum.sparkfun.com/viewtopic.php?t=16169&sid=90de51da367b46f98a226ff968c5b87c interest in that at Sparkfun], so it's a potential business idea.

==Ordering More Stuff==

We ordered the LEDs, some shrink tubing, and some plastic bags (ones which don't seal). Mitch gave us a tip to really cool bags which do seal: [http://www.uline.com/Product/AdvSearchResult.aspx?keywords=anti-static%20poly%20bag Uline poly bags]. You have to order 1000 at once, but even so it's not that expensive ($50).

We also discovered (too late for mouser order!)that we forgot to put the 0.1uF caps in the digikey order, but for now we're going to borrow them from NB, to be returned after our next digikey/mouser order.

Hack Notes CVA 090717 - Revision history

SpammerHellDontDelete: New page: =North Paw Hack Notes, July 17th, 2009= =Sticky Back Velcro= Eric bought $20 worth of sticky back velcro at the Fabric Outlet, and proceeded to cut small pieces for the enclosure, the ba...