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SPI EEPROM as SD card storage?

A project log for SD card sized board, let's say "SDuino"!

Once I was excited to see Intel's announce that they will release "SD card sized computer" but it was not true. This time I made it true!

kodera2tkodera2t 07/05/2015 at 02:340 Comments

Some sort of people are not convinced of what they don't confirm experimentally by themselves but are able to predict naive possibility. Yes I am, too.

All the SD card are required to have mandatory lower compatibility to SPI mode. The key is, SD card interface equipped components are not responsible for that. But I naively thought some computer might talk SPI command through SD card interface... I quickly checked it!

The above picture shows 1M-bits EEPROM inside SD card shell. All the terminal are connected to standard SD-card pinout, then,,, what's happening next?

Inserting Asus, Apple.... nothing happens. Device manager and system info at OS X does not show any information, even they seem not detecting something is inserted! Now I would summarise for those who suspicious guy will not consume their precious time.

Conclusion: SPI EEPROM wired by SD card SPI connection does not work

By the way, SDuino case, you don't need "SDuino writer" just to run your program. Just inserting is enough. It may have some possibility, like "small present" or "some kind of SDcard sized sensor". Just pre-programming and pass it to your friend and you can ask it to work just inserting to SD card connector!

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