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Mass storage with nRF51?

Sensors

I have a project that requires a bluetooth central to be used to gather data from a HRM service, which shouldn't be too much of an issue. However, it also has to store this, and other local sensor data to some sort of storage device (perhaps microSD or Flash memory).

I want to be able to access this data from a PC or other device, but I'm not sure if the nRF51 or nRF52 has the ability to support a file system and act as a USB mass storage device. Would I need to use an additional part to make this possible? If so, what options do I have?

Thanks

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    RK, will that not interfere or clash with the SPI coming from the nRF51? I've not had to do anything like this before, so I'm not sure about the best way to go about it. I'm also not sure what to search for in terms of part description/name?

    Wojtek, unfortunately it has to be a cost effective, scalable design so unfortunately cramming and Edison or rPi in a box won't work :(

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    RK, will that not interfere or clash with the SPI coming from the nRF51? I've not had to do anything like this before, so I'm not sure about the best way to go about it. I'm also not sure what to search for in terms of part description/name?

    Wojtek, unfortunately it has to be a cost effective, scalable design so unfortunately cramming and Edison or rPi in a box won't work :(

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