Programming nrf5e with accelerometer

[yanchevm]

Hi guys, I just ordered doc.mokotechnology.com/index.php device which is nrf52 + accelerometer + firmware that is just broadcasting the location over BLE. This is almost what I want, I just need to customize the device a little. What I need is just the BLE to advertise simple encrypted UUID and when the accelerometer detects movement, the device to stop advertising.
I'm new to programming with Microcontrollers and especially with the Nordic spec.
 
So, my questions are:
1. Which example from the SDK examples to use in order to have a min. changes ?
2. Is there a guide that I can read that will give me a clue what I need to change and how to do it ?

Regards,
Milen Yanchev

[Amanda Hsieh]

Hi,

What I need is just the BLE to advertise simple encrypted UUID

Please see this post and this post.  

and when the accelerometer detects movement, the device to stop advertising.

 Please see this post. 

-Amanda H.

[yanchevm]

Amanda, thanks for the provided posts, but I don't think they are enough for a beginner to write something.

For example, in the post for stopping the advertising, they are explaining some functions that eventually can stop it, but I don't see anything for accelerometer and how it can be integrated with this ble_app_uart project and be used as stopping flag. 

I will really appreciate if there is something like that for a beginners.

Regards,

Milen Yanchev

[Amanda Hsieh]

Hi Milen, 

There is no example of your requirement. You could refer to the nRF52-Bluetooth-Course tutorial and use an event handler to stop advertising (sd_ble_gap_adv_stop() function). 

-Amanda H.

[yanchevm]

Thanks for sharing this course Amanda. It's really useful for someone new to see the big picture.

However, the example doesn't work. Following the step by step guide, when I try to compile it, I get - ‘m_cus’ undeclared (first use in this function).

Then I clone the Git repo and try again, this time I hit another issue with the logging header.

- /home/components/libraries/experimental_log/src/nrf_log_backend_rtt.c: No such file or directory

Can you please fix it ?

Regards,

Milen Yanchev

[Amanda Hsieh]

Hi Milen, 

Which SDK are you using?

Did you clone that repo into SDK v15.0.0/examples/ble_peripheral?

-Amanda H.

[yanchevm]

Hi Amanda,

I'm using SDK v16.0.0.

I have installed SDK v15.0.0 and the GIt example is compiled now. However, I'm still getting issues with the step by step guide. I notices that in the Git example, I have nRF_BLE_Serives folder and my ble_cus.c file is there, however, when I'm making the files manually, both files (.c and .h) are in the Application folder.

Here is when I'm manually creating the files and I hit ‘m_cus’ undeclared (first use in this function) error.

Here is how it look in the Git example. It is compiled without an issues.

What else should I configure ? Where this m_cus defined ?

Regards,

MIlen Yanchev

[Amanda Hsieh]

Hi, 

The tutorial is developed by SDK_15.0.0. You should Download nRF5_SDK_15.0.0_17b948a from the download page and extract the zip to your drive, e.g. C:\NordicSemi\nRF5_SDK_15.0.0_a53641a.

yanchevm said:

What else should I configure ? Where this m_cus defined ?

add a custom service instance called m_cus, i.e. add the following line below the defines in main.c

BLE_CUS_DEF(m_cus);

-Amanda H.  

[yanchevm]

I finally manage to make it compile and work. The problem was in the header file:

The definition of the macros needs to be at the top of the header file:

#define BLE_CUS_DEF(_name)                                                                         
static ble_cus_t _name;        

That solves my problem with ‘m_cus’ undeclared (first use in this function) error.

To continue from here, can you please clarify two things to me:

1. In the example https://github.com/NordicPlayground/nRF52-Bluetooth-Course, I'm creating in step by step new service. Do I need to be connect to the device in order to use this service ?

2. What I need is without connecting the device, when it advertise to be able to read the data. Is there any example for that ?

3. Is there any example of how to configure and handle accelerometer events ?

Regards,

Milen

[Amanda Hsieh]

Hi,

yanchevm said:

1. In the example https://github.com/NordicPlayground/nRF52-Bluetooth-Course, I'm creating in step by step new service. Do I need to be connect to the device in order to use this service ?

In the tutorial, you need the nRF Connect app (for mobile/Desk ).  

 

yanchevm said:

2. What I need is without connecting the device, when it advertise to be able to read the data. Is there any example for that ?

 Please see this post. 

 

yanchevm said:

3. Is there any example of how to configure and handle accelerometer events ?

 There is no example of your requirement on our side. You could create an event and handle it. 

The https://github.com/NordicPlayground/nRF52-Bluetooth-Course#step-5---handling-events-from-the-softdevice shows how to handle the event from Softdevice. 

-Amanda H