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username

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  1. username

    Who is using MSP430G2553?

    For hobby use with low pin counts, yes, always G2553. For commercial use or if more pins are needed, I go with freescale MCUs or whatever i'm forced to use. Yes, I likewise hate the arduino 5V... 3.3V is fine for me in every application even in low power.
  2. username

    Sensorless BLDC motor control

    Very cool that you were able to implement a stable workaround. I can't remember, did you by chance get your sensorless algorithm working? Do you have a video by chance? XD . When I did mine I used Arm core to have a bit more beef & filter options. This was a dev board I made for it, not meant to be tiny. I'll post a video hopefully in a couple days on it but i'd be awesome to see your implementation working as well.
  3. username

    Sensorless BLDC motor control

    It could be me failing at driver writing but I do all my drivers from the ground up in CCS(starting usally with the TI example code). Never touched energia. I've heard of work arounds to get glitchless opperation of TI MSP430 PWM pins but most of them involve waiting. With a BLDC sensorless algorithm, there is no time to wait and all PWM generation must be %100 consistant to reduce jitter.
  4. username

    MSP430+CC2500 board

    Hey all, Been awhile since i've posted something. Here was a small portable 2.4GHz transceiver(CC2500) that I made. This can operate via battery or USB power. USB charges the battery. Has reverse + UVLO + OCLO protection (hence all the transistors on the right portion of the board). Here is a closeup of the RF chain. I used an integrated balun to reduce component counts. I use a 0603 tripad to switch RF output between SMA & chip antenna (unpopulated in pic). I used a coplanar waveguide as a TL. System seemed to be fairly efficient. I get 2.4dBm output power when using the 0 dBm power settings. If i'm not mistaken, TI uses a dev board to measure their power output after discrete balun to SMA. Consequently, I assume the insertion loss of the integrated balun is less than their discrete balun. Someone correct me on that if i'm wrong, i'd be interested to know. I've always wondered on how one would go about verifying a discrete balun. Sorry, source files are not available. If ya know what your doing, the pictures are all ya need. XD
  5. username

    Sensorless BLDC motor control

    MSP430s have glitchey PWM operation. I wouldn't recommend them for this application. A large dev effort would be to get ideal operation out of the PWM pins which ideally shouldn't be your focus. Feel free to chime in someone if i'm mistaken.
  6. username

    Getting a RigidBot 3D printer, help me learn?

    Seems like everyone has their own 3D printer. Here is the one I got for ~330 USD. I don't need any real fancy performance. Just need basic boxes and stuff. http://www.ebay.com/itm/Folger-Tech-Prusa-i3-RepRap-Full-3D-Printer-Kit-w-Clear-Acrylic-Frame-/231301357105
  7. username

    NXP and Freescale to Merge

    This is huge news. Kinda scares me. Freescale struck me as a lot more innovative and bleeding edge where as nxp was expensive but had decent documentation(and not bleeding edge forsure). I hope all the freescale products don't double in price over this. I'm guessing we may see a few counter merges as a result of this. ST & TI?
  8. username

    analog.io

    Basically a new cosom/xively? Looks like a great interface with a good feature set. Very impressive. Best of luck with the site! I'll certainly keep it in mind when I run into another streaming application/project. Somewhere near the bottom of your homepage for non logged in users i'd recommend adding that pricing table. Some people won't bother registering unless they know beforehand the model of the site. Edit: Also not sure why but the login button doesn't work for me. Using firefox but it may be a adblock/firewall issue. Signup worked fine. Once I logged out I couldn't get back in.
  9. username

    What am I going to do with ...

    Hmmm.... in the spirit of 43oh you could make 229 balls of fire demonstrating your fierce loyalty towards the msp430
  10. I'm kinda creeped out by where I moved to as well and was going to do the same thing. I'd use PIR modules and ultra sound modules and have a few different nodes across my house using the NRF 2.4ghz modules. Wireless receive is expensive in terms of RF & current. I'd have a powered hub thats always in receive and have sensors that transmit every 1 - 10 seconds. This method amounts to uA of current usage average for the radio. If ~2x messages are lost or a breach message is sent, have the alarm trip. Sensors would be battery powered and need a recharge every 1-2 months. Would use a lithium + usb charging system. Disarming would require a keyfob type of rfid tag that you could wear. After a trip event your sensor could listen for the fob or if your message reaches the hub, it could ignore all breach messages. Fob would likewise transmit every 1 - 10 seconds and since that doesn't have a sensor attached to it, it could last for years on a single charge. Then perhaps the easiest way to have the web enabled would be use a ras pi or beagle bone server. On the hub you would want a full wavelength antenna such that it can pick up all the sensors in your house.
  11. username

    What am I going to do with ...

    You could create a CPU with 229 cores! You could put Intel i7 quad core to shame! Should only take a week or 2 to make. Edit: Or you could blink like 229x~30 LEDs!
  12. username

    Oven Kickstarter

    Hey guys, Glad to hear you guys got your controllers and hope they work well for you! Europe VAT tax is a beast. Sadly I can't legally mark them as a gift . US has no VAT but it has some of the highest business taxes. Social services / entitlements are very expensive . Not to get into politics but be careful what ya vote for.
  13. username

    Board Offline

    Happy to see it back up, thanks for maintaining the site!
  14. username

    Detect if dog is on the couch

    If you bought an off the shelf weight scale those usually have force sensors(load cells) in them. However, you would risk going over their rated limit with a full couch weight (even divided by 4). Furthermore, they are probably not designed to have constant weight on them. While this may be a bit difficult / awkward, if you had a webcam/camera pointed at the couch you probably could write an image algorithm to detect your dog. Or, if there any internal points in your couch that compress based upon weight, you could use some type of sensing systems internally and trigger for small changes in deflection(aka dog on couch) but not for large deflections (humans). However, there may be spots of the couch blind to this.
  15. username

    MSP430 Nixie Clock

    3 hr to build and looks great! Note, you can download instructions on RobG's Tindie page and they are quite nice! Thanks RobG
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