SD card: store data

[gauteh]

In progress.

• https://users.rust-lang.org/t/wave-buoy-storing-data-to-sd-card-robustly-and-transmitting-over-unstable-connection/75512

• [x] Serialization format: postcard messages in collection files (to stay within FAT32 limits)

• [x] Write to SD-card

• [x] Read to SD-card

• [x] Test read from SD-card on host

• [x] Store to SD card in main loop

• [x] Relay to notecard

• [x] Relay to notecard on failure

Future:

• [ ] Fetch packages on request

[jerabaul29]

Nice discussions there :) . See the FRAM coming up :) .

One option when you build a PCB could be maybe to "plan the traces and holes" for mounting a FRAM breakout, if there is space? :)

[gauteh]

Yes. Although FRAM is a better solution for completely embedded storage, I think SD-card is more practical in out case since:

• the buoys are generally recovered, but electronics might be damaged by water
• FRAM requires an online buoy, or a recovery-station
• I suspect that SD-cards are more robust against water than FRAM
• SD-cards can be easily read from a computer as long as a standard file-system is used

[jerabaul29]

I am not sure about SD card being more robust than FRAM. I would think the contrary, as it would be possible to "hot gun glue" the FRAM chip to protect it 100% from salt water, and "hot glue gun" some soldering pins on the FRAM breakout in the same way. If there is salt water, all what is needed is melt the glue on the soldering pins, and get back access to the traces through pads that were not corroded. But of course only my 2 cents, may be wrong.

[zerblatt007]

Maybe try covering the SD connector in Super Lube PTFE oil for protection against the elements? We use it in Netatmos outdoor cameras to secure a good connection. No problem using the connector with oil on it in readers..

https://helpcenter.netatmo.com/en-us/smart-outdoor-camera-with-and-without-siren/product-interactions/how-is-my-smart-outdoor-camera-protected-against-rain-and-humidity https://www.3dkongen.no//produkt/12g-super-lube-multi-purpose-synthetic-grease-with-syncolon-ptfe/

man. 16. mai 2022 kl. 12:08 skrev JR @.***>:

I am not sure about SD card being more robust than FRAM. I would think the contrary, as it would be possible to "hot gun glue" the FRAM chip to protect it 100% from salt water, and "hot glue gun" some soldering pins on the FRAM breakout in the same way. If there is salt water, all what is needed is melt the glue on the soldering pins, and get back access to the traces through pads that were not corroded. But of course only my 2 cents, may be wrong.

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[gauteh]

Thanks, that will be very useful.

ons. 18. mai 2022, 04:43 skrev Roger @.***>:

Maybe try covering the SD connector in Super Lube PTFE oil for protection against the elements? We use it in Netatmos outdoor cameras to secure a good connection. No problem using the connector with oil on it in readers..

https://helpcenter.netatmo.com/en-us/smart-outdoor-camera-with-and-without-siren/product-interactions/how-is-my-smart-outdoor-camera-protected-against-rain-and-humidity

https://www.3dkongen.no//produkt/12g-super-lube-multi-purpose-synthetic-grease-with-syncolon-ptfe/

man. 16. mai 2022 kl. 12:08 skrev JR @.***>:

I am not sure about SD card being more robust than FRAM. I would think the contrary, as it would be possible to "hot gun glue" the FRAM chip to protect it 100% from salt water, and "hot glue gun" some soldering pins on the FRAM breakout in the same way. If there is salt water, all what is needed is melt the glue on the soldering pins, and get back access to the traces through pads that were not corroded. But of course only my 2 cents, may be wrong.

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. You are receiving this because you are subscribed to this thread.Message ID: @.***>

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