Transfer Speeds at 100m with 15 devices

Hey,

I am having trouble validating this idea through research. I was hoping someone could give me some ballpark feedback.

The setup:

- 15 NRF52832 devices on custom PCB (30mmx50mm)

- All around 100m away outside with little to no obstacles in the way

- I need to stream data from each device. This means that the Bluetooth transfer speed needs to be faster than the combined data collection speed.

- Each device collects at 24kbps. So there is a combined 360kbps of data. 

I imagine that I need to connect to each device individually and receive data. Then cycle through to the next device. 

The connection parameters would be:

- BLE 5.0

- PHY: 2M

- TX power: 4dB

- connection interval 7.5ms

- data packet length extension on

- connection event length extension on

I can calculate theoretical transfer speeds using the nordic online power profiler. However, it's hard to get data at long distances. Also, I am not sure if I can cycle through the 15 devices fast enough?

Can I achieve this transfer rate (360kbps) at 100m? If not, what distance should be OK?

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  • Hi

    I don't think this would be at all feasible at 100m range I'm afraid. Sustaining just one connection at 100 meters using the 2Mbps (or 1Mbps for that matter) PHY is just the theoretical range. I don't think you'll be able to do what you describe at more than 20-25 meters between peripheral and central with the datarate you require in a low interference environment. You'll also have to keep in mind that you'll need time for the connection events as well, check out this post for a word of caution on the matter. You can also check out this post for additional info on the matter of this many links to one central.

    Best regards,

    Simon

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