Lost Connection with nRF52 DK after connecting with BMD101 sensor

[Saffiq]

I am still newbie in nRF52 dk . For my project , i am trying to send data from my sensor to the mobile phone through BLE App UART. Therefore first I have flash nRf52 with the Ble App UART example. After i flash the code, i was able to communicate with via mobile phone and also pc. However after I have connect my sensor to nRF52 board, the board send  two signal to BLE App UART and after that i cannot detect my board anymore except after i have disconnect back my sensor which is connected to TX and RX. What is the problem related to this ? is it because of the buffer size ?

Below is my detail of sensor that I used and example of result shown on BLE App UART. For your information i am using nova 2i with android 7 (Nouget) 

Sensor used : BMD101

- http://m5.img.dxcdn.com/CDDriver/CD/sku.241178.pdf

BLE APP UART:

Normal : 

After connected with sensor

        

[Sigurd]

Hi,

Please try to debug, and see if you are running into the error-handler. I recommend adding the preprocessor define "DEBUG" to your project in order to enable blocking assertions. It's also important that you set the optimization level to 0 when debugging to get the proper call graph. See this post about debugging.

• What SDK version are you using?
• What IDE/toolchain are you using?
• Please confirm that you are using the latest verison of nRF Toolbox

[Saffiq]

SDK Version: 14.2.0 

After i done several test, i found out that the main reason why my board behave like that is because the data that were send from BMD101 sensor is continuous data. Therefore i need to ad nrf_delay in each of the set data that were received via UART. Can you assist me on where i need to add the delay ?

 

[Sigurd]

Is it the ble_nus_string_send() function that is returning an error code?  If yes, what error-code is it returning ?

[Saffiq]

it just says gatt error 0x85 .. I then try to use UART example to check the whether the board are capable to read the sensor value and suddenly termite(serial monitor ) that i used suddenly not responding.. However when i try to send simple data from arduino such as the value=AAAAABBBBB with a delay every data that was send to the board by connect it to the rx of the nrf52832 board, Termite are capable to display the data continuously without any problem. After that i try to send the data without delay  from arduino, then the same problem occur. So what do you think ?

[Sigurd]

It could be that you are overflowing the internal buffers when you are not using the delay. Could you post the code that shows how you are sending the data?

[Saffiq]

Yes ..currently i am trying configure which part of the code that i need to change in order for the data will not overflowing in the internal buffer.. i am using the example for ble app uart from SDK 14.2