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 Post subject: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Wed Apr 03, 2013 5:34 am 
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To my big surprise, my brand new DSO nano v3 does not have the micro SD card reader as advertised...
When connected to the USB port, the computer shows a removable media drive with no media.

Anyone know what is this all about ?


Last edited by stefanu123 on Thu Apr 04, 2013 12:57 am, edited 1 time in total.

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 Post subject: Re: [DSO nano v3] Where did the SD card reader go ?
PostPosted: Thu Apr 04, 2013 12:56 am 
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... and in case anyone wonders if I'm looking at the right side DSO, here are some photos.


Attachments:
photo 3.JPG
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photo 2.JPG
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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 3:18 am 
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Interesting. The drawings posted by Seeed at http://www.seeedstudio.com/wiki/DSO_Nano_v3 display a "TF card slot".


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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 4:30 am 
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Interesting to say the least ...

  • all wiki pages and bazaar pages list the SD card slot
  • they all say the only difference compared to the v2 is the aluminum case
  • any photo that I could find on the internet shows a micro SD card slot
  • all drawings, including the one in the box shows the same card slot

... but it's not there ! And I probably wouldn't have noticed it right away, but I needed a hard copy of a signal I'm working with.

Can't say I'm happy with the Nano so far.


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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 8:41 am 
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That is really unfortunate. Keep in mind how many different companies have produced the Nano, I just got a second one from SainSmart, and they're still producing v2's(which I think I prefer for the D-Pad). Just because you got one without a card slot doesn't change the Nano, it just means you don't really have a Nano. I can't make out the part number in the pic, but it looks like a voltage regulator, which I guess is the "new charging circuit" that they talk about. In other V3s though, I don't think it takes the place of the card reader. Something to look out for, i guess. Also, you should return it and buy from a different store. They definitely screwed the pooch on that one.


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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 2:12 pm 
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The markings on the chip say something like 25PE16 (can't see too well), along with the ST Microelectronics logo, so I'd say it's a M25PE16 (16 Mbit, low-voltage, Page-Erasable Serial Flash memory).

Now I'm facing several dilemmas :
  • sending it back would cost more than the product itself probably, so it's not really an option
  • given the empty drive I get when connected to PC, one can assume it works, and I could just solder in a socket
  • last, but not least, how can I save a hard copy of my signals ? BenF firmware keeps telling me there's no card inserted...

To add to the confusion... there is no answer from Seeed tech support.

@eric25 : I'm not saying it's a bad product, just that I'm not happy with the one I've got; it's purchased from Seeedstudio, it says "Seeedstudio" on the back; just for reference I'm attaching some screen copies of the bazaar pages and more.

About every image from other vendors show the Nano with the card slot. In fact, could not find one without it.

Wiki links :
  • http://seeedstudio.com/wiki/DSO_Nano_v3#Waveform_Storage
  • http://seeedstudio.com/wiki/DSO_Nano_v3#Structure


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File comment: About every image from other vendors show the Nano with the card slot. In fact, could not find one without it.
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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 2:24 pm 
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From the pic you posted of the board, it looks like you could add the slot pretty easily, if you can make a little standoff and use some pins to bridge the gaps to the solder pads. The feet on the cardslot might even be long enough to bend them down to the pads.

I think the only way to save waveforms is on the card, so if you manage to solder it in, I'm 99% sure the BenF firmware will find it and stop showing "no card".

From the placement of the cutout slot in the stock pictures, they may actually use a standoff in the ones with factory-equipped readers, too. It seems like the slot cut in the external casing is about 3-4mm off the board, which would be about right for the flash memory chip being underneath it.

P.S. Just noticed, as an aside, the second picture in the screenshot you attached, the one of all the boxes of Nanos with one box open, is actually a box full of Nano V2s. lol. They aren't very good with details on the website, as you've already noticed.


Last edited by eric25 on Thu Apr 04, 2013 2:46 pm, edited 1 time in total.

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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 2:40 pm 
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Looks like the best way to go for now, but I'm somehow concerned that there may be not enough room for the card slot and card, since the placement seems designed so that the card extends to the outer limit of the casing for removal. Since I have no cutout in the casing, the card position would be shifted.

There is also the option of using a hinge type socket, but I have to make sure there's enough room and the pinout is correct.


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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 2:56 pm 
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Pinout on the hinge type should be fine, I've used both, but I'm pretty sure you'll have to cut a slot in the external housing anyway. For the spring loaded ratchet type, the pic you posted looks to me like the "open" end of the reader slot will hang over the edge of the pcb, giving it the correct position once you cut a slot in the external housing for the actual card insertion. Hard to tell without your Nano and my calipers, but based on the slot housing solder pads, it looks like the microSD card will be positioned just right to click it in and out without needing something to poke it. I'd focus more on clearancing the flash chip underneath it.


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 Post subject: Re: [DSO nano v3] Where did the SD card reader go in V3 ?
PostPosted: Thu Apr 04, 2013 3:06 pm 
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eric25 wrote:
Pinout on the hinge type should be fine, I've used both, but I'm pretty sure you'll have to cut a slot in the external housing anyway.

By pinout I meant that probably I need to put reversed; in which case, that chip is no longer beneath it, but is it enough room ? I'll have to see what socket I can get my hands on first.


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