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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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    So do we think the best approach here might be to use a separate microcontroller to deal with the USB comms, flash/file system, and have the nRF51 act as the system to gather the data from bluetooth and other sensors?

    If that's all the nRF51 is doing though then maybe it's overpowered for the task when I could potentially just get away with some sort of BLE central IC that requires no custom firmware? Does Nordic make a 'dumb' BLE central IC?

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    So do we think the best approach here might be to use a separate microcontroller to deal with the USB comms, flash/file system, and have the nRF51 act as the system to gather the data from bluetooth and other sensors?

    If that's all the nRF51 is doing though then maybe it's overpowered for the task when I could potentially just get away with some sort of BLE central IC that requires no custom firmware? Does Nordic make a 'dumb' BLE central IC?

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