A small device that allows you to temporarily (or permanently) read-only-lock SD/MicroSD cards - V3Designed by FairywrenTech in Latvia
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This device was developed by Karl Lunt back in 2013, then improved by Nephiel in 2014. I recently found out it was never sold or mass-manufactured and people are interested in it, so I've designed a …Read More…
This device was developed by Karl Lunt back in 2013, then improved by Nephiel in 2014. I recently found out it was never sold or mass-manufactured and people are interested in it, so I've designed a PCB, updated the firmware and assembled a couple of those. Since then, the first batch has been sold out, the next (bigger) batch sold out as well - behold, SD locker v3!
This product is fully open-source - hardware and software sources are available through the links below. Lasercut case layer files aren't open-source but that's mostly because I never bothered exporting them properly into a .DXF or similar format - I can do that if someone's interested, message me and I'll find time to export files and make them available to everyone.
Larger SD cards have this mechanical "write protect" slide switch on the side, that you can switch and the card reader can check. However, that switch is more useless than useful, since 1) not all readers support it 2) the OS can ignore it 3) it obviously doesn't apply to MicroSD cards 4) the switch tends to slide accidentally (or fall out of the SD card altogether) when you have no intention of enabling write protection.
There exists a much more reliable method to lock the SD cards - the one this device is designed to use. The controller chips inside the SD cards (of all sizes, whether full-size or MicroSD) are required by the SD card standard to support a low-level command that locks the card into a read-only mode, preventing any changes - either temporarily (can be switched back to read-write) or even permanently (without a way to ever restore the write capability). This device has an ATTiny85 chip can send such a low-level command - this chip connects to the SD card, reads the lock status, shows it using the LED and allows you to toggle the lock status using the button. It supports both temporary and permanent SD card locking, too! Don't worry, I designed the permanent lock capability to be hard to trigger on accident.
There's an option for you to get a SDLocker with ATTiny45 instead of ATTiny85 if you want to save a bit of money - the downside is that if you want to reprogram the SDLocker later to use i.e. a password lock firmware, there's no guarantee that it will fit in the ROM and/or RAM of the ATTiny45. However, it will work with stock TEMP&PERM lock firmware just fine.
Each device is tested by me (on both SDSC and SDHC cards) before I send it out, and is designed so that you don't accidentally PERM-lock the card. Having taken these precautions, I do not take any responsibility for any SD cards you accidentally lock permanently, or any SD cards that may break as a result of using this device.
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