Writing data to SDCard at 1mSec interval using FatFS

[vijaysk]

Hi There,

I'm working on a datalogger project using nrf52840, includes BLE also. I'm using external 24 channel ADC and should be able to log data to the SDCard at the rate of 1000 samples/sec. I'm trying to write to the SDCard using FatFS. Is it really possible to log the data at that rate?. Any application close to my requirement?.

[awneil]

How big are the samples?

[vijaysk]

The samples are of variable lengths and the maximum is 180 Bytes.

[awneil]

So 180k byte/s - plus any overheads ...

[vijaysk]

Yes, you are right.

[Simonr]

Hi

180 kilobytes/s plus overheads will translate to roughly 2 Mbits/s which will not be attainable over BLE. Please check out this blog post on how to maximize throughput over BLE which suggests approximately what speeds you can expect.

Best regards,

Simon