Sanguinololu 1.3a help

Hi guys,

I soldered two sanguinololo boards both using the 1284 chip.
both chips came in with the same bootloader.

my problem is when i connect one board to the pc using the usb-cable nothing happens.. the device is not recognized at all and nothing appears on the device manager - but the power led on the board lights up (so its receiving power from usb).
the second sanguinololo board doesnt face the same problems! i connect it to the computer - the windows finds it and even installs the ftdi drivers and i can see the device under the COM port in the device manager.

any ideas as to what could possibly be wrong with the first board?

cheers

Must be a problem with the FTDI chip. It only needs power to talk to the PC and cause the driver to be loaded.

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[www.hydraraptor.blogspot.com]

so u suggest that i solder a new chip? will get a new one from ebay

Check the existing trcaks solder joints before getting a new chip. They are rarely faulty to start with so something must be wrong with the PCB or the soldering.

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[www.hydraraptor.blogspot.com]

... check for shorts, orientation of the chips and polarity of diodes or such ...

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Viktor
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everything seems perfect O.o im not a master in this but ye im checking it out and everything is in place!

guys in the sanguinololu wiki page they say "Yet another alternative to soldering a IC, could be a USB to TTL-converter"
does that mean that i can use a usb-ttl coverter instead of the ftdi chip on board? how?

Yes the USB to TTL converter is just the same chip on a small PCB. You would need to remove the on board chip and connect the board in its place.

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[www.hydraraptor.blogspot.com]

awesome i will try that.

i have a usb-to-ttl converter with the PL2303 chip O.o not the ftdi 232RL.
it has GND,5v,3.3v,TX,RX

please correct me if im not mistaken:
gnd --> gnd
5v -> 5v
TX -> RX
RX -> TX
DTR-> nothing

need to get some stuff to de-solder this.. will let u know what happens

Don't connect the 5V. It is connected on the Sanguinololu but that causes problems and can damage your PC's USB port.

DTR should connect to the reset pin via the capacitor and auto reset jumper to make loading the firmware easy.

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[www.hydraraptor.blogspot.com]