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Forum Index : Microcontroller and PC projects : SD Card on ubw32

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cosmic frog
Senior Member

Joined: 09/02/2012
Location: United Kingdom
Posts: 284
Posted: 11:22pm 10 Feb 2012
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Hello. I'm thinking of using an SD card adaptor (large one with a slot on the back for a micro SD card) and soldering it straight to the ubw32. I can then use this as a micro SD slot without having to buy a proper, hard to find and expensive card reader. But looking at the scematics, D4 and D5 (card present, card write protect) look as if they goto some kind of switch on the card reader. Could I just connect these to ground to make them active? Thanks.
 
aargee
Senior Member

Joined: 21/08/2008
Location: Australia
Posts: 255
Posted: 11:48pm 10 Feb 2012
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Go ahead.

Write protect shouldn't be a problem, there's no WP in micro SD cards anyway. The Card Present shouldn't be a problem *IF* you leave the card in permanently, otherwise the MM will keep reporting SD card problems.

- Rob.

For crying out loud, all I wanted to do was flash this blasted LED.
 
cosmic frog
Senior Member

Joined: 09/02/2012
Location: United Kingdom
Posts: 284
Posted: 11:56pm 10 Feb 2012
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Thanks for the fast reply. I'll connect them both to ground and ONLY remove/replace the SD card with the power off. Hopefully that should do the trick. I'll let you know if it works.
 
cosmic frog
Senior Member

Joined: 09/02/2012
Location: United Kingdom
Posts: 284
Posted: 10:28pm 24 Feb 2012
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I finally got around to fitting my make-shift SD card reader and it worked first time!
D4-'Card Present' was connected straight to ground.
D5-'Card Write Protect' was left disconnected.
As aargee said, by permenently connecting D4 to ground would cause problems if the card was removed, I can ONLY remove/replace the card if the UBW32 is switched off, I was thinking of fitting a small toggle switch to fix this problem.

Thanks. Dave.
 
Geoffg

Guru

Joined: 06/06/2011
Location: Australia
Posts: 3194
Posted: 08:12am 25 Feb 2012
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One job that has been on my todo list for a long time is to reliably detect when a micro SD has been removed. I have had a few tries at it but so far nothing has proved reliable enough.

If anyone has a solution please let me know.

Geoff
Geoff Graham - http://geoffg.net
 
cosmic frog
Senior Member

Joined: 09/02/2012
Location: United Kingdom
Posts: 284
Posted: 09:12pm 28 Feb 2012
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UPDATE.. It turns out you DO need to connect D5-'Card Write Protect' to ground!
I tried saving to the card today for the first time and it said the card was write protected. All sorted now.

Dave.
 
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