How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

Sigurd — Tue, 26 Oct 2021 14:40:37 GMT

[quote user="IDin"]

Can you tell me more details about enable notification for this characteristic?

[/quote]

I think you can use the function setCharacteristicNotification() for that. https://developer.android.com/reference/android/bluetooth/BluetoothGatt

We have several android libraries and example codes in different repos that you might find useful here: https://github.com/NordicSemiconductor?q=android&type=&language=&sort=

Also, looking at the Cycling Speed and Cadence Profile 1.0, https://www.bluetooth.com/specifications/specs/cycling-speed-and-cadence-profile-1-0/ , it looks like the calculation should be done at the collector side(e.g. phone), and not at the sensor side:

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

IDin — Fri, 22 Oct 2021 15:33:00 GMT

I need make my nRF52-DK TX device always keep sending the data, when I connected it to other RX device over BLE.

So, back to my question,

I already calculated a numeral data, it named "instantaneous_cadence" in CSCS example,but I just can advertising the service "BLE_UUID_CYCLING_SPEED_AND_CADENCE 0x1816" supported feature data, like Cumulative Wheel Revolutions, Last Wheel Event Time, Cumulative Crank Revolutions and Last Crank Event Time.

but I don't know how to advertising others data (user defined data, like I created "instantaneous_cadence" or something others) in this CSCS example.

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

IDin — Fri, 22 Oct 2021 14:56:27 GMT

Hi, Sigurd,

I think that just what I need, but I don't know how to do it.

Can you tell me more details about enable notification for this characteristic?

or can I get some examples for this?

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

Sigurd — Fri, 22 Oct 2021 14:14:58 GMT

From your android app, you need to enable notification for this characteristic, and then the nRF52 will start sending the data.

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

IDin — Fri, 22 Oct 2021 13:56:43 GMT

Hi, Sigurd,

Thanks for your reply.

I means I need to send the instantaneous cadence data (RPM) just like I set up a cycling cadence sensor on bike and connect it to my android apps.

Makes app (Wahoo, Rouvy or others...) can receiving the RPM data correctly.

TT_Power is what I named to my nRF52-DK TX device, you can see it when I connected to this app (Rouvy).

App can receiving the instantaneous power data in 60W, but no instantaneous cadence data (that what I need).

RE: How to output the "instantaneous cadence" data from Cycling Speed and Cadence sensor (CSCS) example through nRF52-DK ?

Sigurd — Fri, 22 Oct 2021 11:34:59 GMT

Hi,

[quote user=""]How make it can output instantaneous cadence data to my device?[/quote]

What do you mean by output? You want to print the value over UART ? or send the data more frequently over BLE ?