Ush Host Cable Help

[Penam]

i was going to build a usb host cable for a USB harddrive but i cant seem to find the parts

can any one break it down into a list ?


http://wiki.gp2x.org/wiki/USB_Hosthttp://w...t_BoB_Schematic

thanks

 

[BenScar]

Where in world are you? I believe I still have a list of Maplin part numbers at home for the USB part of the BoB.

 

[Penam]

Sorry fixed my profile, I'm from Utah, USA.... and I know it says USH. I saw it after I posted.

I have a Hitachi Travelstar C4K40 1.8 " hard drive which only need +3.3VDC to run so I want to build a case that would fit the hard drive, batteries, and the needed circuit.

All i can tell from the schematic is that I need the following :

2: 33 k resistors
2: 15 k resistors
2: 47 pF Caps
1: Samsung S810 mobile phone cable
1: USB cable

Any thing else?

 

[BenScar]

That sounds about right to me.
The Sumsung connector needs to have all the pins in (or at least the ones needed). I've seen a few that only have 3 or 4 pins in there.

Bit of board to make it on is the only other thing I can think you might need.

 

[Penam]

So because the hard drive is self powered do not need the voltage regulator

 

[BenScar]

If the drive runs off the 5v USB it might have a 5v->3.3v converter in it.
How is you Hitachi Travelstar C4K40 packaged?

Looking at the ones I can see though google it seems they're all bare pins with no interface! (I can't be seeing the right one!)

 

[Penam]

I have a USB HDD enclosure for it that I will sacrifice that has an external power supply plug that a set of batteries will power

Hard drive case link

 

[Rekelon]

Hi i am planning on making my cable to plug into the serial for hdd and other items. I was just wondering about a few quick questions.

Basically i wire up my serial connector and connect 10,9 and 13 right? and afterwards if i need the filtering make a cut in the usb cable futhur down the line?

Would i be able to plug a usb hub into this and run two joypads off it or would it be the case that the fireware wouldnt be able to cope with it.

Sorry for sounding stupid but i am abit unsure on the details.

Thanks

 

[BenScar]

I have a USB HDD enclosure for it that I will sacrifice that has an external power supply plug that a set of batteries will power

Hard drive case link

I'm a little confused. Does that enclosure take it's power from the USB
Oh I think I see what you mean, so the power will come from the EXT port at 3.3v and plug into the power slot of the enclosure. I assume that the USB doesn't normally power the HD when it's in the enclosure then?

If that's the case then yes, no power regulator needed.

 

[dpoarch]

Would i be able to plug a usb hub into this and run two joypads off it or would it be the case that the fireware wouldnt be able to cope with it.

I believe there is nothing wrong with this other than you would need drivers to use the gamepads and an actual program that would utilize it and as far as I know no programs out do.

edit: BenScar you are correct about filtering being needed it. It will not work with out it, but the filter isn't that bad too make. About the information in the wiki. I believe those are 33 ohm resistors not kili ohms. It may be mislabled or maybe I am just wrong but I used 33 ohms on mine and it seems to work without any problems.

 

[BenScar]

Basically i wire up my serial connector and connect 10,9 and 13 right?

It's not so much a serial connector on the GP2x side as an EXT plug.
If you take a look at the WIKI there is a list of compatible connectors (I'll find the link in a moment It's Here ) As for the pins, again the WIKI is the best place to check and make sure of that.

and afterwards if i need the filtering make a cut in the usb cable futhur down the line?

I would say the filtering is needed, full stop. I'm told that the signal coming out of the 2x is pretty rough.

Would i be able to plug a usb hub into this and run two joypads off it or would it be the case that the fireware wouldnt be able to cope with it.

You can plug a hub in and have more than one device. Just don't expect any of the EMUs to realise you have joypads plugged in (not yet anyway). The firmware now can handle a USB Hub (I believe) but current applications aren't designed around people using a BoB.

Sorry for sounding stupid but i am abit unsure on the details.

Thanks

All gotta start somewhere, I will say "the search is your friend" Have a search on "break out box" you'll find some threads all about making and/or buying one.

 

[Penam]

BenScar you are correct about filtering being needed it. It will not work with out it, but the filter isn't that bad too make. About the information in the wiki. I believe those are 33 ohm resistors not kili ohms. It may be mislabled or maybe I am just wrong but I used 33 ohms on mine and it seems to work without any problems.

ok is the same thing ture about the 15k being ohms? because all i can find is 10 or 22K at radio shack ( You have questions, we have blank Stares )

 

[dpoarch]

Ok if you are only talking about usb cable it is two 15k ohm and two 33 ohm resistors. This is what I used and my cable works fine. Plus when i went they were out of 47 pF capacitors so I used a 15 and 30 wired in parallel in order to get 45 which isnt exact but it still works.

 

[BenScar]

About the information in the wiki. I believe those are 33 ohm resistors not kili ohms. It may be mislabled or maybe I am just wrong but I used 33 ohms on mine and it seems to work without any problems.

You're right I mis-read the diagram, they're 33 Ohm resisters not 33KOhm.

ok is the same thing ture about the 15k being ohms? because all i can find is 10 or 22K at radio shack ( You have questions, we have blank Stares )

No, they're definatly 15KOhm ones.
Are there any other electrical/electronic shops near you? I think changing the 15K to a 10K or 22K would change the shape of the RC filter somewhat (to what degree I can't remember, been a which since I did filters!), if you can track down some 15KOhm resistors do. Can't say what would happen if you used the others, probably would work but I really not sure.

 

[Penam]

Ok one more just to make sure all of the grounds should connect to a common

check out my image

 

[BenScar]

Ok one more just to make sure all of the grounds should connect to a common

check out my image

Looks right to me.
The VUSB can be left off if you're going to use an external power supply for your enclosure.