[Lab] Launch pad

Sam Roesch samroesch at gmail.com
Mon Sep 20 18:34:38 EDT 2010 

Hey,

Has anyone dealt with interrupts on the Arduino? I'm trying to log the speed
of a off-road buggy, by taking readings from a gear tooth sensor. Any tips
would be appreciated.

Sam

On Mon, Sep 20, 2010 at 2:03 PM, Normand <icipasla at gmail.com> wrote:

> try:
>
> http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=CA&WT.z_homepage_link=hp_go_button&KeyWords=launchpad&x=0&y=0
>
> 4.88$ and the page also link to the datasheet
>
> Normand
>
>
> On Mon, Sep 20, 2010 at 12:28 PM, Darcy Whyte <darcy at siteware.com> wrote:
>
>> is it DIGY.com?
>>
>>
>> On Mon, Sep 20, 2010 at 12:27 PM, Jean-Marc LeBlanc <
>> jeanmarc.leblanc at gmail.com> wrote:
>>
>>> DIGY Key has some available now though
>>>
>>> Jean-Marc Le Blanc
>>> ---
>>>
>>> "Do you pine for the nice days of Minix-1.1, when men were men and
>>> wrote their own device drivers?" Linus Torvalds
>>>
>>>
>>>
>>>
>>> On Mon, Sep 20, 2010 at 12:26 PM, Jean-Marc LeBlanc
>>> <jeanmarc.leblanc at gmail.com> wrote:
>>> > Yeah I bought mine on the second day and received it last week.  If
>>> > you order one of these I would order it right from the TI store and
>>> > not a retailer.
>>> >
>>> > check out their wiki.
>>> >
>>> http://processors.wiki.ti.com/index.php/MSP430_LaunchPad_%28MSP-EXP430G2%29
>>> >
>>> > if you have only used the arduino, keep in mind that the launch pad is
>>> > a little bit more complicated to program than the arduino.  But
>>> > nothing you can't learn.
>>> > If you are interested in my code though let me know.  Ill try to leave
>>> > more detail comments than in the example code.  You can get an Idea of
>>> > how it works
>>> >
>>> >
>>> > Jean-Marc Le Blanc
>>> > ---
>>> >
>>> > "Do you pine for the nice days of Minix-1.1, when men were men and
>>> > wrote their own device drivers?" Linus Torvalds
>>> >
>>> >
>>> >
>>> >
>>> > On Mon, Sep 20, 2010 at 11:18 AM, Tom Burns <tom.i.burns at gmail.com>
>>> wrote:
>>> >> Launch pad is under $5 apiece shipped when purchasing from the TI
>>> e-store
>>> >> and comes with a USB programmer that also serves as debugger and USB
>>> >> backlink.  Only annoyance is a long lead time as they're constantly
>>> >> backordered.. I bought 3 for $14 back in June and received them about
>>> 2-3
>>> >> weeks ago.
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >> On Mon, Sep 20, 2010 at 11:09 AM, Darcy Whyte <darcy at siteware.com>
>>> wrote:
>>> >>>
>>> >>> The Launch Pad thing is less than $5?
>>> >>> My arduino was around 30 bucks assembled.
>>> >>> Wow! Your baby's already getting married?
>>> >>> --
>>> >>> Darcy Whyte
>>> >>> Darcy at Siteware.com
>>> >>> 613-563-3634
>>> >>> Ottawa, Canada | N 45° 25'03.1" W 75° 42'21.4"
>>> >>>
>>> >>> Inspirational Flying Machines:
>>> >>> http://www.rubber-power.com
>>> >>> MAAC 23153
>>> >>>
>>> >>> Social Media, Interaction, SEO
>>> >>> www.generalSocial.com
>>> >>>
>>> >>> Software services since 1988
>>> >>> Web, Database, LAMP
>>> >>> www.Siteware.com
>>> >>>
>>> >>>
>>> >>> On Mon, Sep 20, 2010 at 10:20 AM, Jean-Marc LeBlanc
>>> >>> <jeanmarc.leblanc at gmail.com> wrote:
>>> >>>>
>>> >>>> Hey guy,
>>> >>>> I been using the launch pad for about a week now.  I have not done
>>> >>>> that much with it yet, but I have enough to have a few comments in
>>> >>>> regards.  The first thing I will point out, is that it is not as
>>> easy
>>> >>>> to use as the arduino.  The arduino has its own library that
>>> >>>> simplifies allot of things.  For example if you want to write to the
>>> >>>> serial port with the arduino it is only a matter of
>>> serial.open(baud);
>>> >>>>  serial.print()  or similar.  On the launch pad, you would need to
>>> >>>> figure out how to divide your clock, set an interrupt every X number
>>> >>>> of cycles and set the bit manually.  Same thing with the analog
>>> pins.
>>> >>>> That being said if you have used the arduino with simply the AVR c
>>> >>>> code, then this is not any thing different or if you used any other
>>> >>>> similar processor.
>>> >>>>
>>> >>>> That being said, if you are ok with the take on programming this is
>>> a
>>> >>>> great development platform.  The thing that has impressed me the
>>> most
>>> >>>> is the debugger.  Normally you would need either an expensive
>>> >>>> development board or some JTag.  I never ventured into JTag since it
>>> >>>> looked expensive and complicated and it looked scary ( I don't know
>>> if
>>> >>>> it really is though).  This though, is 4.61$ and you can debug your
>>> >>>> code.  you can set break points, you can see the value of you
>>> >>>> variables and step threw your code.  All you need to do is hit the
>>> >>>> debug button the the eclipse IDE and debug it as you would any other
>>> >>>> eclipse code.
>>> >>>>
>>> >>>> The chip it self is not as powerful as the AVR (arduino). These 16
>>> bit
>>> >>>> processors, only has 2k Flash program space and 128 byte of ram.
>>> >>>> Though for simple projects or drivers these are prefect.  They are
>>> >>>> cheap and you can even sample some for free.  A good use for them
>>> >>>> would be for sensor drivers or line drivers.  For example you could
>>> >>>> have that chip read the temperature convert it to Celsius and then
>>> >>>> that to your arduino (kinda like 2 threads).  I say this because
>>> they
>>> >>>> have some neat features like 10 analog pins.  Another thing I like
>>> is
>>> >>>> you can set an interrupt on raising or falling edges or change of
>>> any
>>> >>>> digital pin.  To my understanding AVR only has 2 pins for that
>>> (please
>>> >>>> correct me if i am wrong).
>>> >>>>
>>> >>>> As for the documentation, it took me a while to find what I needed.
>>> >>>> There is allot of example code with really bad comments so they are
>>> >>>> not that helpful.  what I found the most helpful was the uses guide
>>> >>>> with the data sheet.  I think it would be better if there were more
>>> >>>> comments or explanation.
>>> >>>>
>>> >>>> I have managed to send data to the serial port and read my snes
>>> >>>> controller.  With the new baby and wedding coming up this week end
>>> ;)
>>> >>>> I have not had time yet to put them all together so that it works.
>>>  I
>>> >>>> hope to have my SNES controller work on my PC by the end of the
>>> week.
>>> >>>> If any one is interested in the source.  I will try to comment it as
>>> >>>> much as I can so first time users will understand what is going on.
>>> >>>>
>>> >>>> P.S.
>>> >>>> if you are worried about the small program space, my code is only 64
>>> >>>> bytes and 16 bytes ram.
>>> >>>>
>>> >>>> Jean-Marc Le Blanc
>>> >>>> ---
>>> >>>>
>>> >>>> "Do you pine for the nice days of Minix-1.1, when men were men and
>>> >>>> wrote their own device drivers?" Linus Torvalds
>>> >>>>
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>>> >>
>>> >>
>>> >
>>>
>>
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