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Author Topic: Could you... (micro sd related)  (Read 380 times)
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could you use an arduino and something like this

http://www.ebay.co.uk/itm/Micro-SD-Card-extension-cable-/121378426009?pt=UK_Photography_MemoryCardReaders_RL&hash=item1c42b7cc99

to fool a device that the memory card always had room??

so you would plug the micro sd card/cable into a device, which is connected to an arduino, the arduino is either plugged into a computer or directly into a hard drive and the device would just keep recording a video as the SD card wouldnt get full?

does that make any sense at all?
« Last Edit: July 06, 2014, 03:57:08 am by andy_con » Logged

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I don't know if that is possible, but I think that even if it's possible, can't be do with the cable of the link. The cable of the link is only an extension for the socket of the SD, I believe.
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could you use an arduino and something like this

http://www.ebay.co.uk/itm/Micro-SD-Card-extension-cable-/121378426009?pt=UK_Photography_MemoryCardReaders_RL&hash=item1c42b7cc99

to fool a device that the memory card always had room??

so you would plug the micro sd card/cable into a device, which is connected to an arduino, the arduino is either plugged into a computer or directly into a hard drive and the device would just keep recording a video as the SD card wouldnt get full?

does that make any sense at all?
Not really. The cable you've shown is a male to female extension cable. The only thing you could put at the far end is a micro SD card, unless you cut the end off and connect it to your hard drive somehow. (I doubt that's possible and there are better ways of connecting a hard drive.) Also note that an Arduino isn't suited to streaming video, as its clock speed is too slow.
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Just to clarify..

You want a device that appears to be an SD card to the host computer, but is really doing nothing?

i.e You have some system that requires a card to be connected to operate, but you are using the device for other purpose, e.g. taking an analogue video signal output and don't need the data that is stored by the device onto an SD card.

If so this is technically possible, however as @Henry_Best has stated, the Arduino probably isn't fast enough.

Also AFIK, you'd probably need to write your own code to do this, as the existing SD library etc is designed to communicate with a SD card, not mimic an SD card.

Also... Its likely that the device that needs to record on the SD card uses SDIO commands and not the simple command set that the Arduino uses to write to the card.

Furthermore, the device may occasionally check that data is really being written, which means that your project would need to make the correct fake responses to these requests.


So again, although this is technically possible, its probably too hard to bother with,
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I understand it's possible to get a wireless transmitter which plugs in where an SD storage card would normally fit, which can be used to upload the saved images wirelessly. Maybe this could be used to do whatever the OP is trying to do.

It's also possible to re-flash an SD card to provide different behaviour, such as discarding historical images on a FIFO basis, or not storing them at all. This would involve some pretty specialised knowledge to pull off, though.
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Thanks for the replies

I was thinking of using the device in a mobile phone so you could record for days at a time without running out of storage
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Could you...

                          go back to your original post and click MODIFY and make the title more meaningful so people don't waste time clicking something about which they are not able to give advice.

Thank you

...R
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Done
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Thank you

...R
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I was thinking of using the device in a mobile phone so you could record for days at a time without running out of storage

That doesn't make sense.

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sorry

i want to use a mobile phone to record long footage at 120fps, but you dont get much on a memory card at 120fps.

so some way of using an micro sd extension cable, wiring it to an arduino and then taking the data from the phone and putting it onto a much bigger hard drive
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i want to use a mobile phone to record long footage at 120fps, but you dont get much on a memory card at 120fps.

I think you would probably find it easier to write an app that kept the video in a circular buffer, and solve this problem completely on the phone.
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i want to use a mobile phone to record long footage at 120fps, but you dont get much on a memory card at 120fps.

so some way of using an micro sd extension cable, wiring it to an arduino and then taking the data from the phone and putting it onto a much bigger hard drive

The obvious approach here would be to use a phone with a "USB OTG" port and connect that directly to the hard drive.
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i want to use a mobile phone to record long footage at 120fps, but you dont get much on a memory card at 120fps.

so some way of using an micro sd extension cable, wiring it to an arduino and then taking the data from the phone and putting it onto a much bigger hard drive

The obvious approach here would be to use a phone with a "USB OTG" port and connect that directly to the hard drive.


many thanks, ive got a new sony xperia z2
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the z2 does support usb otg but sadly you cant record straight into an external drive  smiley-sad

plus you couldnt keep a phone charged if the usb port is being used
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