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vinicius.jlantunes

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  1. Like
    vinicius.jlantunes reacted to roadrunner84 in Use of Timer A interrupts   
    It's a very subtle error you made,
    during setup you set CCTL1 = CCIE to enable your interrupt,
    then a few lines later you set the output mode like CCTL1 = OUTMOD_7
    Alas, you're writing to the same register, hence overwriting the CCIE bit you set in it!
    Your solution should be to use CCTL1 |= OUTMOD_7 to mask those bits in, instead of clearing all other bits.
  2. Like
    vinicius.jlantunes reacted to cde in Simple PWM using timer   
    No, it can't be used directly. P1.0 is Timer0_A, clock signal TACLK input only. It cannot be set as a hardware Timer0_A output.
     
    You can use it with a software assisted PWM. You need an Interrupt for your timer, and just have it manually toggle the P1.0 in gpio output mode.
  3. Like
    vinicius.jlantunes got a reaction from spirilis in New edX course using MSP430   
    I subscribed to this a while ago just out of curiosity. My experience with edx courses is great, I've taken 4 or 5 before and am enrolled in a couple others at the moment. It doesn't mean this one will be good for sure, but well, it's a respected school and all that... probably not that interesting for those already experienced with MSP430 or electronics in general, but well, probably good for some.
     
    I am an engineer so I can skip all of those basic topics, but I normally do them anyways to get ideas for the classes I teach.
  4. Like
    vinicius.jlantunes reacted to cubeberg in Christmas PCB - 2014 Edition   
    So last year I made a Christmas Ornament - figured I'd do something again this year.  It's an MSP430 powered Christmas tree!  It uses 2 PCBs that slide together.  There is a button and a motion sensor (cheap spring-based motion sensor).  It uses 12 leds - broken into two sets of 6 that are charlieplexed (so 6 pins total used).  
     
    I managed to score some cheap MSP430G2152's off of Newark for $0.50 each (although the $5 shipping cut into it a bit), but the 10 trees cost well over $100 in total (including $25 shipping to get them here before Christmas).  
     
    For those interested, gerbers and eagle files are attached.  I'll post some code as well - it's just very basic right now.
     

     
     
    Quick video (might put up a nicer one later)
     


     
    It turned out so great - I actually got my wife to solder one!
    tree_v1_part2.zip
    tree_batt_v1.zip
    christmas pcb eagle.zip
  5. Like
    vinicius.jlantunes reacted to spirilis in Charcoal Grill / Smoker Monitor   
    Each AA battery showing ~1.15V now fwiw.  Vcc rail still shows 3.3V and it's still reporting in.
  6. Like
    vinicius.jlantunes got a reaction from bluehash in Embedded Systems/Electronics Black Friday Deals   
    For those in Brazil, Farnell has put out a list of discounts. Nothing caught my eye at first, but there are some oscilloscope modules / unlock codes towards the end for which prices seem good.
    There are also quite a few items with low inventory and huge discounts, I guess they want to get rid of them.
     
    http://www.farnellnewark.com.br/news/3264_Eflyer_BlackFriday14/PrecosBlackFriday_CentraldeVendas.pdf
     
    The document is in Portuguese.
  7. Like
    vinicius.jlantunes reacted to bluehash in Products using MSP430   
    Nice find.
    Looks like it is monitoring analog inputs( Knob, Pitch, Gate ) and clocking( simple I2C ) the values to the main processor.
  8. Like
    vinicius.jlantunes got a reaction from bluehash in Products using MSP430   
    I got this one in a distribution list about MSP430 I am subscribed to.

     

    http://www.korg.com/us/products/dj/monotron_duo/

     

    It's a Korg synthesizer - and they release the schematics for those wanting to mod it:

     

    http://www.korg.com/download/global/monotron_duo_schematic/monotron_DUO_sch.pdf

     

    There you see an MSP430G2231. I did not figure out what it does.

  9. Like
    vinicius.jlantunes reacted to RobG in MSP430 Nixie Clock   
    @@zeke, for you my friend, yes.
     
    @@vinicius.jlantunes, schematic will be included with documentation (will provide the link when they go on sale, ~2 days.)
  10. Like
    vinicius.jlantunes reacted to RobG in MSP430 Nixie Clock   
    MSP430 based Nixie tube clock.
     

     
    I was looking for some nice Nixie tube digit images so I could add them to my EduKit library, but I couldn't find any usable ones. I decided to just buy few of them and photograph myself. Then I thought that it would be a horrible waste if they just sit in a drawer. So here it is, my first Nixie project since... 1987.
     
    This clock will be available as kit, but since this is v1, I will most likely make some adjustments.
    Any suggestions are welcome.
     

  11. Like
    vinicius.jlantunes got a reaction from tripwire in Products using MSP430   
    I got this one in a distribution list about MSP430 I am subscribed to.

     

    http://www.korg.com/us/products/dj/monotron_duo/

     

    It's a Korg synthesizer - and they release the schematics for those wanting to mod it:

     

    http://www.korg.com/download/global/monotron_duo_schematic/monotron_DUO_sch.pdf

     

    There you see an MSP430G2231. I did not figure out what it does.

  12. Like
    vinicius.jlantunes got a reaction from chicken in Products using MSP430   
    I got this one in a distribution list about MSP430 I am subscribed to.

     

    http://www.korg.com/us/products/dj/monotron_duo/

     

    It's a Korg synthesizer - and they release the schematics for those wanting to mod it:

     

    http://www.korg.com/download/global/monotron_duo_schematic/monotron_DUO_sch.pdf

     

    There you see an MSP430G2231. I did not figure out what it does.

  13. Like
    vinicius.jlantunes reacted to Fred in Wishlist Items   
    +2 Kids are great, but don't have any until all your projects are finished!
  14. Like
    vinicius.jlantunes reacted to roadrunner84 in Wishlist Items   
    Second that
     
    vvv @@Fred vvv Or three kids And how is it possible to ever finish all projects?
  15. Like
    vinicius.jlantunes got a reaction from spirilis in Wishlist Items   
    My wish is that I have time for working in projects again - all those LP's sitting in my bench doing nothing make for a saddenning sight.
     

  16. Like
    vinicius.jlantunes got a reaction from roadrunner84 in Wishlist Items   
    My wish is that I have time for working in projects again - all those LP's sitting in my bench doing nothing make for a saddenning sight.
     

  17. Like
    vinicius.jlantunes reacted to abecedarian in NI / Mouser MultiSIM BLUE now available   
    http://www.mouser.com/MultiSimBlue/
     
    Circuit simulation, PCB layout, et cetera.
  18. Like
    vinicius.jlantunes reacted to DickB in Electromagnetic pendulum clock   
    This pendulum clock is not only regulated by the pendulum, but it is driven by it.  A hidden magnet in the pendulum swings past a hidden coil and induces a current.  This is detected and then a current pulse is fed into the coil, creating an electromagnet that repels the pendulum to keep it moving.
     
    Others have designed and built clocks like this, but as far as I know mine is the only one using a microcontroller to fine-tune the pendulum's speed to keep accurate time. 
     
    The coil's output is filtered and fed into an MSP430 comparator, set on an interrupt to wake the microcontroller up.  The microcontroller delays a bit to let the magnet swing away from the coil some for optimal push, then feeds a variable-length pulse (typically 25 mS) into the coil via an output port connected to a PNP transistor.  If the pulse duration is increased, the pendulum swings farther and slows down.  If decreased, the pendulum speeds up.  The ratchet mechanism used to convert pendulum motion into rotary motion had to be designed to accommodate this variation in pendulum swing angle.  By varying the pulse width, the clock can be sped up or slowed down about 1%.  The pendulum needs to be manually adjusted, by setting the height of the bob, to within this tolerance.  To facilitate that, I use a dual-color LED driven by two output ports.  The LED flashes red if the pendulum is too slow, and green if it is too fast.  It usually takes only a few minutes to adjust the bob.  
     
    Once the bob is set, the microcontroller can maintain accuracy.  I've implemented a modified PID (proportional - integral - derivative) control system to derive the pulse width and regulate the clock. Accuracy is basically the same as the watch crystal used to drive the timer/counter. 




  19. Like
    vinicius.jlantunes reacted to RobG in EduKit BoosterPack   
    After couple of years and many ideas, I have finally settled on a design for my experimenter's board. 
    Say hello to EduKit BoosterPack. 
     

     
    The EduKit BP comes with 1.8" color LCD and 8 accessory connectors. Each connector provides access to power and 2 or 4 MCU pins and are used to connect accessory boards. Those boards will allow user to perform tests and experiments, and could be used to teach about MCU's. There are also 4 jumpers on the board, which are used to change LCD's connections. LCD can use SPI1 (UCA0) or SPI2 (UCB0,) CS and D/C have also 2 possible connection options.
     

     
    Accessory boards can be simple, for example switch, LED, or potentiometer, or can be more complex, like shift register, mic with amp, sensors, MIDI, GPS.
     

     
    The EduKit is meant to be used with MSP430G2 LaunchPad (though it could be used with any other LP,) and will come with a library that will allow easy setup and use of LCD. User can write his code and then display results using one of the included functions (text, bar graph, etc.)
  20. Like
    vinicius.jlantunes reacted to bluehash in [Group Buy-15] [D] BFL MSP430 + Tiva Launchpad Protoplate   
    @@vinicius.jlantunes sorry. GB is closed. I marked it.
  21. Like
    vinicius.jlantunes got a reaction from Gab3Ru55 in Some 1341 chips, free or small price   
    Wow, I was off for a few days and come back to this! :grin:
    Cool!
     
    I will reply to each one of you via PM soon. @jsolarsly, shipping the whole lot abroad may be too expensive and cause trouble with customs unfortunately...
     
    As for the styrofoam concerns, I hope they don't kill the circuits and have tested a couple which are working fine. But well, you may get parts that don't work... I didn't have much black foam so I had to improvise.
     
    I will probably keep one or two of some IC's to myself, but will start shipping the others as I go through the replies. Then I will PM you my paypal account for shipping costs.
  22. Like
    vinicius.jlantunes got a reaction from Gab3Ru55 in Some 1341 chips, free or small price   
    This is a collection that started some good 15-20 years ago with a friend that went to engineering school. Then her brother who also went to the same school inherited it all, who then gave it to me as he was moving to a smaller apartment.
     
    So the other day I needed something and saw that pile of circuits. Reluctantly I set off to organize that mess and compiled a list of the 1341 individual circuits. There are many that could probably go to a museum, such as the 80161 microprocessor, but there are also many other circuits that may still be useful to someone.
     
    List:
    https://docs.google.com/file/d/0B_Lm1IIYqoUsMXMyUlViVWhVQUU/edit?usp=sharing
     
    I don't like seeing all this stuff laying around, not being put to good use. So I will donate most of the items if anyone is interested - you would only need to pay for the shipping. I live in Brazil, but can probably ship small quantities in envelopes for about US$ 5-10 to most places.
    Depending on the item (if I realize it holds significant value) we may trade it for something else, including money ;-)
     
    But I think for the most part, items will go for free if there are people interested.
     
    There are some parts I could not identify - those are marked with question marks (?) on the list. If anyone would fancy googling a bit more than the 30 seconds I spent per item to find out what it is... I appreciate. I can take pictures of unidentified IC's if anyone would like.
     
    Some pictures are attached.



  23. Like
    vinicius.jlantunes got a reaction from georgebrindeiro in Some 1341 chips, free or small price   
    This is a collection that started some good 15-20 years ago with a friend that went to engineering school. Then her brother who also went to the same school inherited it all, who then gave it to me as he was moving to a smaller apartment.
     
    So the other day I needed something and saw that pile of circuits. Reluctantly I set off to organize that mess and compiled a list of the 1341 individual circuits. There are many that could probably go to a museum, such as the 80161 microprocessor, but there are also many other circuits that may still be useful to someone.
     
    List:
    https://docs.google.com/file/d/0B_Lm1IIYqoUsMXMyUlViVWhVQUU/edit?usp=sharing
     
    I don't like seeing all this stuff laying around, not being put to good use. So I will donate most of the items if anyone is interested - you would only need to pay for the shipping. I live in Brazil, but can probably ship small quantities in envelopes for about US$ 5-10 to most places.
    Depending on the item (if I realize it holds significant value) we may trade it for something else, including money ;-)
     
    But I think for the most part, items will go for free if there are people interested.
     
    There are some parts I could not identify - those are marked with question marks (?) on the list. If anyone would fancy googling a bit more than the 30 seconds I spent per item to find out what it is... I appreciate. I can take pictures of unidentified IC's if anyone would like.
     
    Some pictures are attached.



  24. Like
    vinicius.jlantunes got a reaction from GeekDoc in Some 1341 chips, free or small price   
    This is a collection that started some good 15-20 years ago with a friend that went to engineering school. Then her brother who also went to the same school inherited it all, who then gave it to me as he was moving to a smaller apartment.
     
    So the other day I needed something and saw that pile of circuits. Reluctantly I set off to organize that mess and compiled a list of the 1341 individual circuits. There are many that could probably go to a museum, such as the 80161 microprocessor, but there are also many other circuits that may still be useful to someone.
     
    List:
    https://docs.google.com/file/d/0B_Lm1IIYqoUsMXMyUlViVWhVQUU/edit?usp=sharing
     
    I don't like seeing all this stuff laying around, not being put to good use. So I will donate most of the items if anyone is interested - you would only need to pay for the shipping. I live in Brazil, but can probably ship small quantities in envelopes for about US$ 5-10 to most places.
    Depending on the item (if I realize it holds significant value) we may trade it for something else, including money ;-)
     
    But I think for the most part, items will go for free if there are people interested.
     
    There are some parts I could not identify - those are marked with question marks (?) on the list. If anyone would fancy googling a bit more than the 30 seconds I spent per item to find out what it is... I appreciate. I can take pictures of unidentified IC's if anyone would like.
     
    Some pictures are attached.



  25. Like
    vinicius.jlantunes got a reaction from RobG in Some 1341 chips, free or small price   
    This is a collection that started some good 15-20 years ago with a friend that went to engineering school. Then her brother who also went to the same school inherited it all, who then gave it to me as he was moving to a smaller apartment.
     
    So the other day I needed something and saw that pile of circuits. Reluctantly I set off to organize that mess and compiled a list of the 1341 individual circuits. There are many that could probably go to a museum, such as the 80161 microprocessor, but there are also many other circuits that may still be useful to someone.
     
    List:
    https://docs.google.com/file/d/0B_Lm1IIYqoUsMXMyUlViVWhVQUU/edit?usp=sharing
     
    I don't like seeing all this stuff laying around, not being put to good use. So I will donate most of the items if anyone is interested - you would only need to pay for the shipping. I live in Brazil, but can probably ship small quantities in envelopes for about US$ 5-10 to most places.
    Depending on the item (if I realize it holds significant value) we may trade it for something else, including money ;-)
     
    But I think for the most part, items will go for free if there are people interested.
     
    There are some parts I could not identify - those are marked with question marks (?) on the list. If anyone would fancy googling a bit more than the 30 seconds I spent per item to find out what it is... I appreciate. I can take pictures of unidentified IC's if anyone would like.
     
    Some pictures are attached.



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