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thanhtran

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  1. thanhtran

    MSP430 Launchpad very very basic UART

    Go to Ti.com, search for the chip that you're using. Then download the example codes. It should have an example which allows you to send / receive UART data. In the example, you should see how you can connect the wires / pins. If you want the UART to talk to a PC's serial port, you need a level adapter in between the MSP and the PC.
  2. Looks really nice. Thanks for the answer about modifying the ATX Power supply.
  3. thanhtran

    How to initialize MSP430F5510 correctly?

    There is a write up on TI site somewhere about the watch xtal giving OSC fault flag. I made a water pump controller last week using a launchpad with a watch xtal. The watch crystal was very sensitive to noise and present of an 120v line next to it. I didn't want to debug problem and didn't want the risk of overflowing my basement with water so I stopped using it.
  4. What's the highest voltage one can achieve with modifying the ATX power supply? At sometime I needed 32.4v and 36v to charge my battery pack (A123 cells - for an RC helicopter), and there was no charger available at the time for this kind of voltage, so I had to incorporate a step-up regulator (to 50v max from 12v) and a MSP430 to modify the feedback voltage of the regulator. http://www.rcgroups.com/forums/showthread.php?t=928136&
  5. thanhtran

    MSP430 Launchpad v1.5 to MSP430 Launchpad v1.4 Resolder

    Nice work! The little components with no marks are not fun to work with after you have disassembled them. I've been cooking QFN chips & boards on a small cooker. Smallest I can do is the Itg3200 gyro. Couple times it doesn't work the first time, and it requires another pass on the cooker with some tapping on the chip when the solder melt. I think putting a chunk of aluminum on it would be a good idea since it keeps the temperature steady.
  6. thanhtran

    [Call for Designs] CC3000 WiFi BoosterPack

    I have to try the sample code on the F2553 to see if it has enough space first.
  7. thanhtran

    [Call for Designs] CC3000 WiFi BoosterPack

    This was my quick and dirty break out board. I overcooked the pcb on a cooker and the flux turned brown, but it still works
  8. Have you also tried removing the test and reset jumpers too?
  9. thanhtran

    Cutting PCBs

    If you have the board thin enough, you can cut it with a pair of scissors. I usually use 0.8mm board for this reason (besides the weight issue (for flying toys) or for my laminator) I've never cut any board with vias so I don't know if cutting the board with scissors would damage those vias or not. I imagine if you have enough spacing & clearance, cutting it would cause no harm to near by vias.
  10. thanhtran

    Glue recommendation

    +1 for hot glue. It works best with if the parts being glued are warm to hot (preheat with a heat gun)
  11. thanhtran

    Glue recommendation

    I also use CA glue with accelerator on all things that need glue. The accelerator is needed if I want quick bond and no messy trace of CA smoke on the place near the join. It's not perfect though. It's brittle. Silicon base glue sounds like a good solution. Any name that I can use?
  12. thanhtran

    MSP430F5510 powered by USB port without an extra LDO?

    Yes, I use toner transfer method for this board. It gives correct track sizes compared UV transfer method that I used to use. Thanks. Btw, we are neighbor. I'm in Fredrick.
  13. thanhtran

    MSP430F5510 powered by USB port without an extra LDO?

    My 5510 test board next to a SD card
  14. thanhtran

    MSP430F5510 powered by USB port without an extra LDO?

    Thanks Jazz and Rob for the replies. I connected the VUSB to the MSP VCC. I tried a code that flashed some LEDs. It worked. But If I loaded some code that supposed to enumerate the USB port, the USB port itself didn't enumerate. I looked at Rob's circuit (http://forum.43oh.com/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=2190) and realized that I didn't have a diode between VUSB and the MSP VCC line. After adding this diode, the USB is now enumerate just fine. Not sure why, but I will use this Thanks again -Thanh
  15. thanhtran

    MSP430F5510 Breakout Board

    Looks great. How big is this PCB?
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