nRF52840-DK selection example for management/data acquisition from heart rate sensor and temperature sensor

[Fpoli]

Hi everyone, I'm new to DevZone.

I am writing to ask for info for the first application with BLE.

I need to send data acquired by sensors, RAW mode, via the BLE application to the smartphone APP.

In this regard I have installed Segger Embeded Studio and Nordic SDK v17.0.2 and I have seen that there are many examples made available by Nordic. I have board nRF52840-DK with hw pca10056.

I would like to use the stack present in S140. Which example should I use, as a template, to acquire from my heart rate and temperature sensors and send it(RAW format)  to the smartphone app?

Thanks to all in advance.

Fpoli

[Fpoli]

Thanks for the reply.

I'll take a look at NUS example, in the nRF5_SDK_17.0.2 and I'll update you..

Another info, for me "nRF52840 board", is best that I make a client or server BLE?

Sorry if my request is silly, I'm new in the BLE world

BR

Fpoli

[awneil]

Your nRF would be the Peripheral, and your phone the Central.

There are many tutorials on the interwebs covering the basics of BLE; eg,

https://www.argenox.com/library/bluetooth-low-energy/

[Fpoli]

Great!

Thanks so much

BR

Fpoli

[Fpoli]

Hello everybody.

After the advice received, and thank you, especially at awneil, I have studied and now I have many clearer things about BLE.

I refer to GAP and GATT role, pre connection and post connection etc. etc. I also saw examples for using NUS,

I uploaded to my board, I used: C: \ Nordic_Semi \ nRF5_SDK_17.0.2 \ examples \ ble_peripheral \ ble_app_uart I have also modified and now I want to send data, by pressing button 3 of the nRF52840-DK, to the nRF Toolbox UART app.

Now the question is, where do I set the maximum BLE connection speed and how much I can set the maximum MTU value, now is: NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247

Thank you in advance.

BR

Fpoli

[Einar Thorsrud]

Hi,

Fpoli said:

Now the question is, where do I set the maximum BLE connection speed and how much I can set the maximum MTU value, now is: NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247

If you by connection speed mean throughput, then you will typically set NRF_SDH_BLE_GATT_MAX_MTU_SIZE  to 247 as you do, NRF_SDH_BLE_GAP_DATA_LENGTH to 251 and NRF_SDH_BLE_GAP_EVENT_LENGTH to a high value like 320, and use a connection interval that matches that (so that the event length is same as connection interval). Then send data as notifications.