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

Adam Skory askory at gmail.com
Mon Mar 23 14:00:10 PDT 2009


OK, so I just want two chips, and Lamont wants one.

Lamont, I can add the all three chips to the bulk order if you promise
to pay me back, or you can add it yourself and paypal the money for
your one. I don't mind, but let me know soon what you prefer.

As far as the RBBBs and BUB boards, so far Eric wants 2 RBBBs, I think
I want 2, and probably 1 BUB board each would be good too. Anyone else
speak up and I'll order those.

(Yes, the compactness of the FTDI cable is good, but I like the
cheapness of their BUB board and since it's only for when I'm
reprogramming the RBBBs not so worried that it's bulkier.)

On Mon, Mar 23, 2009 at 1:52 PM, Lamont Lucas <lamont at cluepon.com> wrote:
>
> 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
>>>>>>
>>>>>
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>>>>>
>>>>
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>>
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