Expected range when using NUS with a datarate of 40kBit/s (5kByte/s)

[Michael01101]

Hello,

In our project, we have a BMD-300 module, which contains a nRF52832 chip, and a nRF52840DK. The BMD-300 module is used as peripheral and the nRF52840DK is used as central.

The BMD-300 module sends data via NUS to the nRF52840DK with a data rate of 40kBit/s. This works well.

At the moment we are achieving a range of 5m. If we increase the distance between both devices to 10m, we are starting to receive errors in the BMD-300 module, which causes a reset and a reconnect.

We are curious, if this is the maximum achievable range with a Tx-power of 0dBm. The ble_nus_data_send() function gets called every 40ms with a payload of 200 bytes.

So here is our question:

Is 5m the maximum achievable range when using NUS to transfer data at a data rate of 40kBit/s with a Tx-power of 0dBm?

Thank you very much in advance.

[Andreas]

Hi,

 

This is highly dependent on the environment in your area, but generally ~5m does not sound a lot. It might be that the module antenna is not optimally if you have placed it incorrectly or something, you should compare with a NRF52 DK.

Also check out this range calculator from Bluetooth SIG: https://www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/range/#estimator

 

Best regards,

Andreas

[Michael01101]

Hello,

thank you for your response.

I will check that out.