[Cyborg] Fwd: [Noisebridge-discuss] Re: March Digikey Bulk Order

Mon Mar 23 21:53:25 UTC 2009

I just spoke with the people at SchmartBoard.  They said that they do make a board that makes it super easy to do parts like the compass chip.  I spoke with Neal, and he was super friendly and helpful.  If you give him a call, then he can probably help you find the board you need for it.  His number:

     510-659-1549 x13

Mitch.

----------------- 

> Date: Mon, 23 Mar 2009 13:52:24 -0700
> From: lamont at cluepon.com
> To: rachel at xtreme.com
> Subject: Re: [Cyborg] Fwd: [Noisebridge-discuss] Re: March Digikey Bulk Order
> CC: cyborg at lists.noisebridge.net
> 
> 
> Page 4 of the datasheet shows the broken down diagram, with the 
> measurement I'm calling "spacing" being lowercase e, the center-of-pin 
> to center-of-pin measurement. That's the one that I can't find an 
> off-the-shelf adapter for, since everybody else seems to think that 
> PLCC-20 is 0.05" between center-of-pin, or 1.27mm.
> 
> Since honeywell includes a photo as you pointed out, it's not a typo in 
> the datasheet and I'm left with nothing but making a custom PCB, unless 
> someone has better google skills than me. 
> 
> If we order the chip first, it's helpful to lay the chip on a laser 
> printed paper version of the board to make sure the pins all line up. 
> And I'll probably laser cut a stencil at TechShop to make the soldering 
> easier.
> 
> Rachel McConnell wrote:
> > That compass board is 4mm across. There are 5 pads. The pic on the
> > datasheet shows the pads right up next to a mm ruler, and in fact
> > further down it claims the distance across all the pads & the spaces
> > between is 2.5mm. Given that, I don't see how the spacing could be as
> > big as .5mm but it is absolutely not any larger.
> >
> > However, 0.05" is a lot bigger than 0.5 mm so if those are the only 2
> > options, I am baffled. Or possibly just even more ignorant about what
> > 'spacing' means than I thought.
> >
> > R
> >
> > Lamont Lucas wrote:
> > 
> >> Oh, and cause I like replying to myself, here's another board adapter
> >> that I thought would allow us to mount the chip with just a fine point
> >> iron:
> >>
> >> http://www.schmartboard.com/index.asp?page=products_plcc&id=85
> >>
> >> $9, but I think it's the wrong board.
> >>
> >> it *says* PLCC-20, but the pin spacing is 0.05", (1.27mm) whereas we
> >> need 0.5 mm spacing according to the datasheet for the HMC5843. I'm
> >> starting to wonder if the datasheet is wrong, as every other source I've
> >> found says 0.05" for the PLCC, but honeywell claims 0.5mm.
> >>
> >> The other PLCC-20 smt adapter board that I have also has an incorrect
> >> pin spacing in inches, so I'm left wondering what the hell honeywell is
> >> doing, seeing as what they're calling PLCC has nothing to do with what
> >> the rest of the world does. (PLCC, plastic leadless chip carrier)
> >>
> >> I'll try and make an adapter board in eagleCAD tonight and submit it for
> >> folks' inspection.
> >>
> >> Finally, here's someone on sparkfun trying to use the chip with no love:
> >>
> >> http://forum.sparkfun.com/viewtopic.php?p=68979#68979
> >>
> >> I'll hopefully get a response back from him, as he's successfully
> >> mounted the chip, even if he can't use it correctly.
> >>
> >> Lamont Lucas wrote:
> >> 
> >>> Please add one more to the order for me, and I'll work with you on
> >>> surface mounting the thing. I have a hot-air rework station that will
> >>> be useful for undoing whatever we mess up. I've used a toaster oven
> >>> for SMT reflow, but I'd like to do this with a regular hot-plate, as I
> >>> think that method is superior.
> >>>
> >>> We'll need to either order an adapter PCB for the PLLC-20 (aka
> >>> LPCC-20), or make a custom one. The board I have from sparkfun for
> >>> the Honeywell HMC1052L is a 4 pin-per-side 16-pin-LLC. I'm capable of
> >>> designing and ordering the adapter board, but I wouldn't get a chance
> >>> to do it till tuesday night at the earliest, and I'm out of town for a
> >>> week starting friday.
> >>>
> >>> This solderless socket might help with the prototyping:
> >>> http://www.chiptool.net/adapter/plcc-1.htm
> >>>
> >>> That 1052L chip, by the way, I spent the weekend trying to use. 
> >>> Unlike the HMC5843, the HMC1052L requires a 400 mA pulse for 2 uS to
> >>> clear out any lingering magnetic fields, which requires an h-bridge or
> >>> at least a totem-configured pair of FETs. I started wiring it up, but
> >>> after I've added an h-bridge chip, 2 capacitors, two resistors etc,
> >>> the resulting cost and bulk make me think that I should have just
> >>> started with the $19 5843, rather than "saving" via the $8.50 1052L.
> >>>
> >>> That BUB board looks nice, although I'm still super happy with my FTDI
> >>> cable, just for compactness's sake.
> >>>
> >>> Adam Skory wrote:
> >>> 
> >>>> I want to order two of the HMC5843 3-axis compass chips in the hope
> >>>> that someone will help me figure out how to surface mount the damned
> >>>> things.
> >>>>
> >>>> (
> >>>> http://parts.digikey.com/1/parts/1599656-sensor-magnetic-3-axis-20-lcc-hmc5843.html
> >>>>
> >>>> )
> >>>>
> >>>> Anyone else want some? It would be good to add them to today's digikey
> >>>> bulk order.
> >>>>
> >>>> Also, I'm looking at getting some RBBB kits and a couple USB BUB
> >>>> boards, separately from the digikey order, but it would good also to
> >>>> know how many of those we should get.
> >>>>
> >>>> ( http://moderndevice.com/RBBB_revB.shtml and
> >>>> http://www.moderndevice.com/connect.shtml )
> >>>>
> >>>> -Skory
> >>>>
> >>>>
> >>>> ---------- Forwarded message ----------
> >>>> From: miloh <froggytoad at gmail.com>
> >>>> Date: Mon, Mar 23, 2009 at 10:52 AM
> >>>> Subject: [Noisebridge-discuss] Re: March Digikey Bulk Order
> >>>> To: noisebridge-discuss at lists.noisebridge.net
> >>>>
> >>>>
> >>>> RE: Digikey bulk order
> >>>>
> >>>> Correction: didn't mean to suggest one needs to find dr_jesus on IRC,
> >>>> the directions for being included are posted on the wiki:
> >>>> https://www.noisebridge.net/wiki/Digikey_Bulk_Order
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Mon, Mar 23, 2009 at 9:40 AM, miloh <froggytoad at gmail.com> wrote:
> >>>> 
> >>>> 
> >>>>> Friendly reminder: the March Digikey is going out by the afternoon,
> >>>>> contact dr_jesus in IRC to get in on the action.
> >>>>>
> >>>>> -rma
> >>>>> 
> >>>>> 
> >>>> _______________________________________________
> >>>> Noisebridge-discuss mailing list
> >>>> Noisebridge-discuss at lists.noisebridge.net
> >>>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >>>> _______________________________________________
> >>>> Cyborg mailing list
> >>>> Cyborg at lists.noisebridge.net
> >>>> https://www.noisebridge.net/mailman/listinfo/cyborg
> >>>>
> >>>>
> >>>> 
> >>>> 
> >>> _______________________________________________
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> >>> Cyborg at lists.noisebridge.net
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> >>>
> >>>
> >>> 
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> >> 
> >
> >
> > 
> 
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