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juani_c

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Posts posted by juani_c

    Volt/Amp/Watt meter

    in Projects

    Posted

    I have a doubt about the INA219 resolution. The bus voltage measurement has two full-scale ranges: 16V or 32V, but for what i understand from the datasheet the resolution is allways 4mV. This makes sense with the 16V range because it has a 12 bit adc, so 16/4096=0.0039 V

    The 32 range should have twice that resolution, wright?

     

     

    Seeed - Free $10 coupon with PCB order - good until 1/20

    in Embedded Systems/Test Equipment Deals

    Posted


    Well, I came across a new vendor, http://www.elecrow.com/services-c-73/fusion-pcb-service-c-73_116/'>Elecrow. They provide exactly same services as Seeed does and from what I can see, they use the same fab.
    Prices and s/h charges are the same (including free shipping for >$50,) the only difference is FREE color, even black.
    I will order something today and see what's this company is all about.

    Elekfreak also has free colors and similar service;
    http://www.elecfreaks.com/3268.html'>http://www.elecfreaks.com/3268.html

    FM radio

    in Projects

    Posted

    I like your documentation.

    Thanks! the main reason for all that writing is just to have an excuse to write in English and practise my grammar/spelling/vocabulary etc.

     

    A good place for buying TEA5767 is suntekstore.com

    I haven't heard about that site, i will check it out. Is it reliable? Thanks.

    FM radio

    in Projects

    Posted

    I've started to build a simple FM radio. It is based in a small module with a TEA5767. The code it's pretty basic for now, I'm just sending a fix frequency as part of the initial tests.

     

    #include 
#include "USI_I2CMaster.h"

int StatusCallback(unsigned char c)
{
return TI_USI_EXIT_LPM; // Exit active for next transfer
}

void main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;

BCSCTL1 = CALBC1_16MHZ; // Set range
DCOCTL = CALDCO_16MHZ; // SMCLK = DCO = 1MHz

/* Initialize USI module, clock ~ SMCLK/128 */
TI_USI_I2C_MasterInit(USIDIV_7+USISSEL_2+USICKPL, StatusCallback);

unsigned char TxDataConfig[5] = {0x2E,0xBA,0x10,0x10,0xC0};

/*Write data, configuration register
TI_USI_I2CWrite(SlaveAddress, Length, Multi, TxData) */
__disable_interrupt();
TI_USI_I2CWrite(0x60, 5, 0,TxDataConfig);
__bis_SR_register(LPM0_bits + GIE);

TI_USI_I2CStop();

}

     

    You'll find more information here.

    buying ICs on ebay

    in General Electronics

    Posted

    Hi guys! I've seen that a lot of you buy stuff on ebay, there are really good prices there (we have a local version here but it's not that great). I was looking around the electronics section and there are a lot of nice and cheap ICs, maybe too cheap... :eh: I'm concerned about losing my money buying a bunch of counterfeit parts. So, have you got any advice or some tips in order to avoid this kind of issues? should I buy semiconductors there?

    And in case you ask me; why ebay instead of digikey, arrow, etc...? It's only because it has much cheaper (or even free!) shipping costs.

    thanks!

    Launchpad Modification and Reproduction?

    in General

    Posted

    Perhaps a simpler-smaller Launchpad?, without the debugging interface (just the TUSB3410 for serial com) and a 3.3v LDO? I was working in something that looks like that. Fewer parts, making it easier to solder, and all of them available through Texas samples program ;) so no need to unsolder.

    Logo.

    in Suggestions

    Posted

    some thougths;

    when I saw the first logos a voice in my head said "lottery!!" (it actually said QUINI 6, but thats how is called it here)

    then I saw the logos at the bottom and there was the voice again: "casino!!"

     

    i migth have a game problem...

    MSP430 BootStrap Loader

    in General

    Posted

    it appears that the x2xxx family has an internal Bootstrap loader in a ROM. This would make the BSL untouchable. Is this correct? Is the BSL the only way to program the devices?

    You can use JTAG for programming or in some of them Spy by Wire. There is table in a TI document that shows all the different families and the supported programming interfaces.(I'll try to find it...)

    Some of the devices from the new msp430G line also have BSL, I want to program a MSP430G2553 using a TUSB3410 usb-rs232 converter and in a future make a small board, something like a...

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