RE: ADXL accelerometers and surface mount chip
FROM: basicstamps@yahoogroups.com email list group
DATE: 3/14/01
==================== some selected email list messages ==================
Date: Sun, 11 Mar 2001 20:06:00 EST
From: CHIPKEN@aol.com
Subject: Re: Re: ADXLxxx Accelerometer
If you want to try out the BS2p with the ADLX202 try the pbasic code below.
This creates a level sensor display on a LCD.
Chuck
'program uses a 40 x 2 lcd, Optrex DMC40218, and a tilt/motion sensor,
'Analog Devices ADXL202, uses 500k ohm on pin 5 & 0.1uf cap on pins 11 & 12
'shows 2d level position on the lcd
'10/28/00
t1x var word
t1y var word
x var word
y var word
s con 8
pause 1000
gosub LCDINIT
aa:
lcdcmd s,1
pulsin 0,1,t1x
pulsin 1,1,t1y
t1x=2865-t1x
t1y=2865-t1y
x=(t1x/14)+128:y=(t1y/14)+192
lcdout s,x,[$00]
lcdout s,y,[$01]
pause 50
goto aa
'initialize LCD
LCDINIT
lcdcmd s,48 'set function
lcdcmd s,48
lcdcmd s,48
lcdcmd s,32
lcdcmd s,44
lcdcmd s,8 'display off
lcdcmd s,12 'display on
lcdcmd s,6 'set mode
lcdcmd s,1 'clear display
lcdout s,64,[$11,$1b,$1b,$1f,$0e,$0e,$04,$04]
lcdout s,72,[$04,$04,$0e,$0e,$1f,$1b,$1b,$11]
return
----------------------
Date: Sun, 11 Mar 2001 21:06:59 -0700
From: Dwayne Reid
Subject: Re: Re: SO to DIP package adapters
At 04:52 PM 3/11/01 -0800, Stephen Roberts wrote:
>I still _do_ have some of these adapter "kits". They let you solder an SO-8
>IC onto the adapter, then put it in any DIP-8 socket, for prototyping. I
>used them for the LTC2400 part. If anyone is interested, please contact
>me__off-list__.
>
>Unfortunately Mohamed's MAX7219 is a 24-pin SO part, so I can't help there.
>Sorry!
perhaps I should preface with a big, bold, [ADVERTISMENT] warning . . .
I just got my latest batch of boards in. Because I had some extra space on
the panel, I added some little 8 pin SMT adapters in the extra space. I
have FAR more than I need, so the extras are for sale.
You will get a little strip of PCB material with (5) SO-8 to DIP SMT
adapters. You have to cut them apart with tin snips or scissors, solder on
the SMT chip and add pins. The boards are double sided with plated thru
holes and solder mask.
I've done things a little backwards - I work with both 0.150" and 0.200"
wide SO-8 parts. Because there just isn't enough room to mount a 0.200"
wide SO-8 with gull wing leads between 0.3" DIP spaced leads, I've chosen
to mount the SMT part on the BOTTOM of the little adapter. In practice, it
has worked quite well. Removing the SMT chip from the bottom of the
adapter is a bit of a chore (not difficult, merely tedious) but I find that
I usually don't need to do that anyways.
My asking price is US 1.00 for 1 strip of 5 so-8 adapters.
I've also got a few so-28 adapters available. These are double sided with
plated through holes but no solder mask (they came from AP Circuits proto
service). They can be used for all 0.2" wide so parts up to 28 pins and
should work just fine with the MAX7219.
The so-28 adapters are US $1.00 each and I only have a few of them right
now.
Add US $0.75 for shipping.
Please contact me off list.
dwayne
Dwayne Reid
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 17 years of Engineering Innovation (1984 - 2001)
--------------
From: Brice D. Hornback [mailto:bdh@cyberbound.net]
Sent: Friday, March 09, 2001 11:33 PM
To: basicstamps@yahoogroups.com
Subject: Re: [basicstamps] Re: ADXLxxx Accelerometer
The best way to experiment with the ADXL202 accelerometer is to purchase the
evaluation board. The samples currently available are the ADXL202JE which
is a 5mm x 5mm x 2mm 8-lead hermetic LCC package. No leads! VERY tough to
solder wires to and VERY tiny. Unless you have an 8-lead LCC chip carrier
or you custom build a board and reflow the solder (yes, you can buy the
solder paste and reflow in a toaster oven)... it's best to stick with the
evaluation board. The part number for the evaluation board is ADXL202EB.
More information regarding the ADXL202EB can be found here:
http://www.analog.com/techsupt/eb/ADXL202EB_0.pdf
- Brice
----- Original Message -----
From:
To:
Sent: Friday, March 09, 2001 5:10 PM
Subject: [basicstamps] Re: ADXLxxx Accelerometer
Hello! If anyone is interested, Analog is giving away samples on
these devices today.
-->Start Quote
"A check indicates that a limited number of samples are available
today through the ADI web site. "
-->End Quote
(I am not affiliated with Analog--just out looking for some free
samples... ;)
--- In basicstamps@y..., "Dennis P. O'Leary" wrote:
> www.analog.com/iMEMS/products/ADXL202.html has links to tech notes
and
> articles, including Stamp code.
>
> Dennis
>
> -----Original Message-----
> From: K- Jay [mailto:kev1718@h...]
> Sent: Wednesday, February 28, 2001 7:53 PM
> To: basicstamps@y...
> Subject: [basicstamps] ADXLxxx Accelerometer
>
>
> I have seen in the past, some code for
> reading the ADXLxxx Accelerometer. Does
> anyone know where I can find some code
> on that subject.
>
> Thanks
> K-Jay
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
>
>
>
>
---------------
Date: Mon, 12 Mar 2001 22:06:20 -0500
From: Jason Lavoie
Subject: Re: SMT
ideally, yes. but where I used to work we would use the pneumatic
syringes, and sometimes they would last months.. nobody took care of it,
and the worst that would happen is that it would get a bit too thick and
would start to get gummed up.
I think if you just kept it in a relatively cool place (near the A/C
vent?) it should be ok
Jason
Al Williams wrote:
>
> I've looked into this. The problem is the solder paste has to be kept
> refrigerated and because of this you can only get it sent overnight. I
don't
> know if the wife would let me put solder paste into the fridge....
>
> Al Williams
> AWC
> * Expand your Stamp I/O: http://www.al-williams.com/awce/pak3.htm
>
> >
> > Go to the Seattle Robotics Society's web page and look in the
Encoder
> > for how to solder SMT devices using a toaster oven. Very cool stuff.
> > http://www.seattlerobotics.org/
> >
> > ----- Original Message -----
>
-----------
Date: Mon, 12 Mar 2001 05:52:54 -0500 (EST)
From: Stew Benedict
Subject: Re: SMT
A good iron, tweezers and a magnifying light if your eyesite's not real
good. I'm talking a Weller or Edsyn type iron with a base station. Can
be adjustable, but not necessarily. A very long, pointed tip is what I
prefer, and very fine solder.
I find pre-tinning the pads, or some folks use solder paste,works well.
You need to work quick, and not overheat the part. In particular, ceramic
caps are susceptible to cracking damage, which may not be evident
immediately, but may drive premature failure down the road. Don't try to
accelerate cooling off the part after soldering.
Stew Benedict
On Sun, 11 Mar 2001, Chris Loiacono (E-mail) wrote:
> Has anyone ot there become adept at soldering surface-mount devices to
> boards either at home, or in a small workshop without all the expensive
> tools? If so, would you care to share some of the basics?
>
>
>
----------------
Date: Mon, 12 Mar 2001 08:34:07 -0800 (PST)
From: John DeFeo
Subject: Re: SMT
Chris,
It is easy to solder SMT devices without the expensive
equipment. Hand soldering is time consuming and would
be OK for 1 or 2 prototypes.
To hand solder you will need a pair of tweezers, rosin
flux and 0.10" diameter solder.
Procedure:
For Resistors/Capacitors;
1. Apply flux to PCB footprint for component to be
soldered. If you use a rosin flux and allow to dry it
will become tackie. This will help hold the component.
2. Use the tweezers and place the component.
3. Using to 0.010" diam wire solder, lay the solder
along the component lead. Apply heat. Repeat to other
lead.
For IC's
1. Apply flux to PCB footprint for component to be
soldered. If you use a rosin flux and allow to dry it
will become tackie. This will help hold the component.
2. Apply solder to one of the IC pads.
3. Use the tweezers and place the component, and hold.
4. Using the soldering iron heat the pad which has to
solder applied and allow solder to flow onto IC pin.
5. Using to 0.010" diam wire solder, lay the solder
along the component leads. Apply heat.
By using the 0.10" diam wire solder you will get the
proper amount of solder to make a good joint.
If you have any other questions please feel free to
contact me directly.
Regards,
John DeFeo
Director, Engineering
Motion Sensors Inc.
Ph: 252-331-2080
Fax: 252-331-1666
e-mail: jwdefeo@yahoo.com
WEB site: http://www.motionsensors.com
--- "Chris Loiacono (E-mail)"
wrote:
> Has anyone ot there become adept at soldering
> surface-mount devices to
> boards either at home, or in a small workshop
> without all the expensive
> tools? If so, would you care to share some of the
> basics?
>
>
------------
Date: Sun, 11 Mar 2001 16:52:27 -0800
From: Stephen Roberts
Subject: Re: SO to DIP package adapters
I still _do_ have some of these adapter "kits". They let you solder an SO-8
IC onto the adapter, then put it in any DIP-8 socket, for prototyping. I
used them for the LTC2400 part. If anyone is interested, please contact
me__off-list__.
Unfortunately Mohamed's MAX7219 is a 24-pin SO part, so I can't help there.
Sorry!
Steve
--------------------------------------------------------------------
Steve Roberts: sroberts@sunstroke.sdsu.edu
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