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juani_c

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Posts posted by juani_c

  1. it looks like the pot has quite some friction and is able to hold the pendulum?

    yes, that's due to a crappy potentiometer and a lightweight pendulum, in this kind of setups the device used to mesure the angle is usually some sort of optical encoder or something like that in order to avoid any kind of friction. Unfortunately I don't have such a device and I thought about making one but the potentiometer was a faster option.

  2. suppose I have to calcule this;

    y=(((x2-x1)+(x3-x1))/3)+x1;

    and I want to know how to break it down in order to have the best code in C. Does anyone know of any good resources for learning how to optimize this kind of tasks?

  3. Can you recall if the Smart Metering Board is one of these two devices?

    1. EVM430-FE4272

    2. EVM430-F47197

     

    I found them on this page.

    I found these boards and thought that maybe is one those but I really can't tell. I made a search in TI's e-Shop and there is nothing similar to a Smart metering board. Kind of a mistery....

     

    I'll show my ignorance of spanish here by guessing the meaning for fun:

    "Cheap horse?"

    Is something like Gift horse actually. The complete phrase is; A caballo regalado no se le miran los dientes. I found a very similar phrase in English; Don't look a gift horse in the mouth.

  4. Talking about RF( and cheap/free RF) this came with TI's RF newsletter, perhaps you have already seen it, anyway;

     

    "Radiocrafts offers free RF module plug-in boards to the TI Smart Metering Board

    RC2400HP As a partnering company with Texas Instruments, Radiocrafts offers free RF module plug-in boards to the TI Smart Metering Board, providing users with a quick and easy access to wireless metering. The plug-in board can be delivered with Radiocrafts

  5. and you can submit an Eagle file (if you use Eagle, like I do), rather than generating in the multi-file Gerber format (though Laen will take those, too).

     

    that's good to know. I've seen that most o this kind of service asks you for GERBER files and I don't really know how to make those and, what it's more important, how to make them right. INternational shipping is only 5U$S so I might try them in the future

  6. If you end up designing your own board, I highly recommend The Dorkbot/PDX order. I had some made, and they are excellent quality and cheap! (Do be sure to double-check your designs, though. :oops: )

     

    I don't if anybody know about the PCB service that seeestudio has, well there is another place called itead studio that has the same service but is cheaper, 12 U$S for 5x5cm boards and shipping is quite cheap if you don't mind waiting. You can order max. 10 boards and the minimum is 3 boards but as you are paying anyway the 12 U$S you should order 10.

    I haven't used the service but i've heard good things about it.

  7.  

    When I opened the invoice from TI Singapore, it was mentioned as "DDP Delivered Duty Paid", means no duty is required.

     

    Unnecessarily got harassed by local Customs & Courier, but finally went through.

     

    Mines said that too and they charged me anyway. I will be more careful next time.

    P/S: the bill is from FeDex but the delivery was made by DHL

  8. if u live outside US, be prepared to pay (1) tax, (2) custom clearance (brokage), even w/ free shipping. i end-up paying $20+ canadian for 2 of these when i order in september.

     

    That's rigth. I had to pay 50% of the value (in Argentina) due to custom taxes. I thougth that maybe I would not have to pay since i'm not "actually paying" but the bill was inside the package and they considered as a purchase. :(

  9. If theres interest, I might be able to post some code with a circuit to do this. I'm currently working on a small side project where I do some DSP to recognize the heart beat in an EKG (called QRS detection for those who are curious).

     

    I'm studying bioengineering and i really like those projects that involve biomedical data acquisition and processing. I want be able to implement it but it would be intersting to see how it is done.

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